Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce

Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce

Introduction

Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce transforms an affordable cut of beef into an impressive centerpiece. This dish combines tender flank steak with a savory filling of melted Gouda cheese, earthy mushrooms, and fresh spinach. Furthermore, the velvety mushroom cream sauce adds restaurant-quality elegance to every bite.

This stuffed flank steak recipe delivers gourmet flavor without complicated techniques. The filling stays perfectly contained within the beef, creating beautiful spiral slices when carved. Additionally, the preparation takes less time than you might expect for such an elegant presentation.

Whether you’re planning a special dinner or want to elevate your weeknight meals, this recipe fits the occasion. Moreover, the combination of ingredients creates layers of flavor that satisfy without overwhelming the palate. The Gouda cheese melts beautifully, binding the filling together while adding creamy richness.

What Makes This Stuffed Flank Steak Special

The Perfect Cut of Beef

Flank steak works exceptionally well for stuffing because of its flat, rectangular shape. This lean cut rolls easily around fillings, creating an attractive presentation. Additionally, flank steak absorbs flavors beautifully while remaining tender when cooked properly.

The meat’s natural grain runs lengthwise, making it ideal for butterflying. When you slice against the grain after cooking, each piece showcases the spiral of filling. Furthermore, flank steak cooks relatively quickly compared to thicker cuts.

A Flavor-Packed Filling

The combination of Gouda, spinach, and mushrooms creates perfect harmony. Gouda cheese provides nutty, slightly sweet notes that complement the earthiness of mushrooms. Meanwhile, fresh spinach adds color, nutrition, and a subtle vegetable presence.

This filling mixture balances richness with freshness. The mushrooms contribute umami depth, while the spinach prevents the dish from feeling too heavy. Moreover, the Gouda melts into every crevice, binding the ingredients together.

Luxurious Mushroom Cream Sauce

The mushroom cream sauce elevates this dish from good to extraordinary. Rich and velvety, it enhances the earthy flavors already present in the filling. Additionally, the sauce adds moisture, ensuring every bite remains succulent.

This sauce complements rather than overpowers the stuffed steak. The cream base provides smoothness, while sautéed mushrooms add texture. Furthermore, fresh herbs brighten the sauce, preventing it from tasting flat.

Ingredient Breakdown

For the Stuffed Flank Steak

Flank Steak (2 pounds): Choose a steak with even thickness for uniform cooking. Look for bright red color and minimal surface moisture.

Gouda Cheese (8 ounces, shredded): Aged Gouda offers more pronounced flavor, while young Gouda melts more smoothly. Either works beautifully in this recipe.

Fresh Spinach (3 cups, packed): Baby spinach requires less preparation than mature leaves. Wash thoroughly and pat completely dry before using.

Mushrooms (2 cups, sliced): Button, cremini, or baby bella mushrooms all work well. Clean with a damp cloth rather than rinsing to prevent waterlogging.

Garlic (4 cloves, minced): Fresh garlic provides the best flavor. Avoid pre-minced varieties for this recipe.

Olive Oil (3 tablespoons): Use quality extra virgin olive oil for sautéing the vegetables.

Salt and Black Pepper: Season generously to enhance all the flavors.

Fresh Thyme (1 tablespoon, chopped): This herb complements both the beef and mushrooms perfectly.

Kitchen Twine: Essential for securing the rolled steak during cooking.

For the Mushroom Cream Sauce

Mushrooms (1½ cups, sliced): Use the same variety as in the filling for consistency.

Heavy Cream (1½ cups): Full-fat cream creates the richest sauce. Avoid substituting with lower-fat alternatives.

Butter (3 tablespoons): Unsalted butter gives you better control over seasoning.

Shallots (2, minced): These provide a milder, sweeter flavor than onions.

Garlic (2 cloves, minced): Reinforces the garlic notes in the filling.

Beef Broth (½ cup): Adds depth and balances the cream’s richness. Choose low-sodium broth for better seasoning control.

Fresh Parsley (2 tablespoons, chopped): Brightens the finished sauce and adds visual appeal.

Dijon Mustard (1 teaspoon): Provides subtle tang without being obvious.

Salt and Pepper: Adjust to taste throughout the cooking process.

Kitchen Tools You’ll Need

Having the right equipment makes preparation smoother. A sharp knife ensures clean butterflying of the flank steak. Additionally, a meat mallet helps pound the steak to even thickness.

You’ll need kitchen twine for securing the rolled steak. Furthermore, a large oven-safe skillet allows you to sear and finish cooking in one pan. A meat thermometer takes the guesswork out of doneness.

For the sauce, a medium saucepan works perfectly. Moreover, a whisk helps create a smooth, lump-free consistency. Finally, a cutting board large enough to work with the flattened steak makes assembly easier.

Step-by-Step Preparation Guide

Preparing the Flank Steak

Start by placing the flank steak on a large cutting board. Position the steak so the grain runs horizontally in front of you. Using a sharp knife, carefully butterfly the steak by cutting horizontally through the middle, stopping about half an inch from the opposite edge.

Open the steak like a book, creating one large, flat piece. Cover with plastic wrap and gently pound to an even thickness of about ½ inch. This ensures uniform cooking and easier rolling.

Season the inside surface generously with salt and pepper. Let the steak rest at room temperature for 15 minutes while you prepare the filling. This allows for more even cooking later.

Creating the Filling

Heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Add the sliced mushrooms in a single layer, avoiding overcrowding. Cook without stirring for 3-4 minutes, allowing them to develop golden-brown color.

Stir the mushrooms and continue cooking until they release their moisture and become tender. This takes approximately 5-6 minutes total. Add the minced garlic and cook for another minute until fragrant.

Add the fresh spinach in batches, stirring as it wilts. Season with salt, pepper, and fresh thyme. Once all the spinach has wilted, transfer the mixture to a colander. Press out excess moisture using the back of a spoon.

Let the vegetable mixture cool for 5 minutes. This prevents the cheese from melting prematurely during assembly. Meanwhile, preheat your oven to 375°F (190°C).

Assembling the Stuffed Steak

Spread the cooled mushroom-spinach mixture evenly over the butterflied steak, leaving a 1-inch border on all sides. Sprinkle the shredded Gouda cheese evenly over the vegetables. Press everything down gently to help it adhere.

Starting from the short end closest to you, tightly roll the steak away from yourself. Keep the roll as tight as possible to prevent filling from escaping. Once rolled, tie the steak with kitchen twine at 1½-inch intervals.

Secure the ends with additional pieces of twine. Pat the outside of the rolled steak dry with paper towels. Season the exterior generously with salt and pepper.

Searing and Roasting

Heat the remaining tablespoon of olive oil in a large oven-safe skillet over medium-high heat. Once the oil shimmers, carefully place the stuffed steak in the pan. Sear for 2-3 minutes per side until deeply browned all around.

Transfer the entire skillet to the preheated oven. Roast for 25-30 minutes until the internal temperature reaches 135°F (57°C) for medium-rare or 145°F (63°C) for medium. Use a meat thermometer inserted into the thickest part.

Remove the skillet from the oven and transfer the steak to a cutting board. Tent loosely with aluminum foil and let rest for 10-15 minutes. This resting period allows juices to redistribute, ensuring moist, tender slices.

Making the Mushroom Cream Sauce

Building Flavor Layers

While the steak rests, prepare the mushroom cream sauce.

Melt the butter in a medium saucepan over medium heat. Add the minced shallots and cook for 2-3 minutes until softened and translucent. Stir in the garlic and cook for another 30 seconds until aromatic.

Add the sliced mushrooms to the pan. Cook for 5-7 minutes, stirring occasionally, until the mushrooms release their liquid and begin to brown. The mushrooms should be tender and golden at the edges.

Creating the Cream Base

Pour the beef broth into the pan, scraping up any browned bits from the bottom. These bits add tremendous flavor to the sauce. Let the broth simmer for 2 minutes to reduce slightly.

Lower the heat to medium-low and pour in the heavy cream. Stir continuously to combine everything smoothly. Add the Dijon mustard and whisk it into the sauce thoroughly.

Let the sauce simmer gently for 5-7 minutes until it thickens enough to coat the back of a spoon. Stir occasionally to prevent scorching on the bottom. The sauce should reduce by about one-third of its original volume.

Final Seasoning

Taste the sauce and adjust the seasoning with salt and pepper as needed. Remember that the steak is already seasoned, so balance accordingly. Stir in the fresh chopped parsley just before serving.

Keep the sauce warm over very low heat while you slice the steak. If the sauce becomes too thick, thin it with a splash of beef broth. Conversely, if it seems too thin, continue simmering for another minute or two.

Cooking Tips for Perfect Results

Butterflying Technique

Practice makes perfect when butterflying flank steak. Use a very sharp knife and make smooth, steady cuts. Keep your free hand flat on top of the steak to gauge thickness as you cut.

If you’re uncomfortable butterflying meat yourself, ask your butcher to do it. Most butchers happily provide this service at no extra charge. Additionally, they can pound the meat to even thickness if requested.

Preventing Filling Leakage

Tight rolling is crucial for keeping the filling inside. Roll slowly and deliberately, tucking in any escaping vegetables as you go. Moreover, avoid overfilling, which makes rolling difficult and increases leakage risk.

The kitchen twine should be snug but not so tight that it cuts into the meat. Space the ties evenly to maintain consistent shape throughout. Furthermore, always tie the ends securely to seal them closed.

Temperature Control

Use a reliable meat thermometer for accuracy. Insert it into the center of the roll, avoiding the filling if possible. The temperature will continue rising 5-10 degrees during resting.

Don’t skip the resting period after cooking. This step is essential for juicy results. Cutting immediately causes all the flavorful juices to run out onto the cutting board.

Achieving Perfect Sear

Make sure the skillet is hot before adding the steak. The oil should shimmer but not smoke. Additionally, pat the meat dry before searing to promote browning.

Resist the urge to move the steak while searing. Let it develop a deep brown crust on each side. Furthermore, use tongs rather than a fork to turn the meat, preventing juice loss.

Serving Suggestions

Plating the Dish

Remove the kitchen twine before slicing the stuffed flank steak. Use a sharp knife to cut the roll into ¾-inch thick slices. Arrange 2-3 slices on each plate, slightly overlapping them to showcase the beautiful spiral.

Spoon the warm mushroom cream sauce generously over and around the slices. The sauce should pool slightly on the plate while also coating the meat. Garnish with additional fresh parsley or thyme sprigs for color.

Side Dish Pairings

This rich main course pairs beautifully with lighter side dishes. Consider serving roasted asparagus or green beans to add freshness. Moreover, the vegetables provide color contrast against the beef and cream sauce.

Creamy mashed potatoes complement the sauce wonderfully. The potatoes soak up any extra sauce on the plate. Alternatively, garlic roasted potatoes offer a slightly lighter option with excellent flavor.

A simple arugula salad with lemon vinaigrette cuts through the richness. The peppery greens and bright acid balance the creamy elements. Furthermore, the salad adds nutritional value and textural variety.

Bread Accompaniments

Crusty artisan bread is perfect for soaking up the mushroom cream sauce. Warm the bread slightly before serving for the best experience. Additionally, garlic bread offers complementary flavors without competing with the main dish.

Dinner rolls provide a softer alternative for those who prefer it. Brush them with butter and herbs for extra appeal. Moreover, bread helps stretch the meal when serving larger groups.

Storage and Reheating Instructions

Proper Storage Methods

Allow leftover stuffed flank steak to cool completely before storing. Wrap the remaining portion tightly in aluminum foil or plastic wrap. Place it in an airtight container to prevent odor absorption.

Store the steak and sauce separately in the refrigerator. This prevents the meat from becoming soggy. Properly stored, both components last 3-4 days in the refrigerator.

For longer storage, freeze the cooked steak for up to 3 months. Wrap it first in plastic wrap, then in aluminum foil for double protection. Label with the date to track freshness.

Reheating Guidelines

Reheat sliced steak gently to avoid drying it out. Place slices in a baking dish with a splash of beef broth. Cover tightly with foil and warm in a 300°F (150°C) oven for 15-20 minutes.

Alternatively, reheat individual portions in the microwave. Use 50% power and heat in 30-second intervals. Add a tablespoon of broth to maintain moisture during reheating.

Warm the mushroom cream sauce separately in a small saucepan over low heat. Stir frequently to prevent separation. If the sauce seems thick, thin it with a little cream or broth.

Nutritional Information

Per Serving (Based on 6 Servings)

This Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce provides substantial nutrition. Each serving contains approximately 520-580 calories, depending on portion size. The dish offers 38-42 grams of high-quality protein per serving.

The fat content ranges from 35-40 grams per serving, primarily from the cheese, cream, and beef. Saturated fat accounts for about 18-20 grams of the total. Additionally, each serving provides roughly 8-12 grams of carbohydrates.

Nutritional Benefits

Flank steak provides excellent protein along with iron and B vitamins. These nutrients support energy production and healthy blood cells. Moreover, beef contains zinc, which supports immune function.

Spinach adds vitamins A, C, and K, plus folate and iron. This leafy green contributes minimal calories while boosting nutritional value. Furthermore, spinach provides dietary fiber and antioxidants.

Mushrooms offer B vitamins, selenium, and potassium. They’re naturally low in calories and fat. Additionally, mushrooms provide unique compounds that support immune health.

Dietary Considerations

This recipe contains dairy from the cheese and cream sauce. Those with lactose intolerance should consider this. However, aged Gouda contains less lactose than younger cheeses.

The dish is naturally gluten-free when prepared as written. This makes it suitable for those avoiding gluten. Moreover, it fits into low-carb and keto-friendly eating patterns.

For lower fat content, consider using half-and-half instead of heavy cream. You can also reduce the cheese slightly without sacrificing too much flavor. Furthermore, trimming any visible fat from the flank steak before butterflying reduces overall fat content.

Recipe Variations

Cheese Alternatives

While Gouda works beautifully, other cheeses create delicious variations. Gruyère offers similar nutty notes with excellent melting properties. Swiss cheese provides a milder flavor that some prefer.

Sharp cheddar creates a bolder, more assertive flavor profile. This works especially well if you enjoy stronger cheese tastes. Additionally, fontina cheese melts smoothly and adds subtle earthiness.

For a more luxurious version, try adding a thin layer of blue cheese. Use it sparingly, as its strong flavor can overwhelm. Moreover, combining two cheeses creates complex flavor depth.

Vegetable Variations

Roasted red peppers add sweetness and color to the filling. Chop them finely and drain well before adding. Sun-dried tomatoes provide intense flavor and pair wonderfully with the other ingredients.

Caramelized onions create sweetness and depth. Cook them separately until deeply golden before incorporating. Furthermore, sautéed leeks offer a milder onion flavor that complements the mushrooms.

Add fresh herbs like basil or oregano for Italian-inspired flavors. Rosemary pairs excellently with beef and mushrooms. Moreover, a touch of fresh sage adds earthy sophistication.

Sauce Variations

Transform the mushroom cream sauce by adding different elements. A splash of balsamic vinegar provides tangy sweetness. Whole grain mustard adds texture and robust flavor.

For a lighter sauce, use chicken or vegetable broth as the base. Thicken with a cornstarch slurry instead of relying on cream reduction. This cuts calories while maintaining good flavor.

Add fresh or dried herbs to customize the sauce. Tarragon creates a French-inspired profile. Thyme reinforces the earthiness, while dill offers unexpected freshness.

Protein Alternatives

This preparation method works with other cuts of beef. Try it with flank steak’s cousin, skirt steak. Butterflied sirloin tip also rolls nicely and offers different texture.

Pork tenderloin accepts this treatment beautifully. Butterfly it lengthwise and fill as you would the beef. The cooking time may vary slightly based on thickness.

For poultry lovers, large chicken or turkey breasts can be pounded thin and rolled. Adjust cooking times and temperatures appropriately for safe poultry preparation. Moreover, ensure the internal temperature reaches 165°F (74°C).

Common Mistakes to Avoid

Overfilling the Steak

Less is more when it comes to filling. Overstuffing makes rolling difficult and increases leakage during cooking. Leave adequate border space around the edges for proper sealing.

Pack the filling down gently but don’t pile it too high. A thin, even layer works better than thick clumps. Additionally, squeeze out excess moisture from the vegetables before spreading them.

Inadequate Seasoning

Flank steak benefits from generous seasoning. Don’t be timid with salt and pepper on both the inside and outside. Remember that the filling and sauce add flavor, but the meat itself needs seasoning too.

Season in layers throughout the cooking process. The vegetables need seasoning when sautéing. Additionally, the sauce requires proper seasoning before serving.

Incorrect Cooking Temperature

Avoid cooking the stuffed steak at too high a temperature. This causes the outside to overcook before the center reaches proper doneness. Medium heat for searing and moderate oven temperature work best.

Use a meat thermometer rather than guessing doneness. Visual cues can be misleading with stuffed preparations. Furthermore, account for carryover cooking during the resting period.

Skipping the Resting Period

Never cut into the steak immediately after cooking. Resting allows the juices to redistribute throughout the meat. Cutting too soon results in dry steak with all the juices on the cutting board.

Plan the resting time into your meal preparation. Use this period to make the sauce or finish side dishes. Moreover, the steak actually becomes easier to slice after resting.

Poor Knife Skills

Use a sharp knife for butterflying and slicing. Dull knives tear the meat rather than cutting cleanly. This affects both presentation and texture.

Slice against the grain for maximum tenderness. The grain in flank steak is obvious once you look for it. Additionally, use a smooth sawing motion rather than pressing down forcefully.

Frequently Asked Questions

Can I prepare this Gouda, Spinach and Mushroom Stuffed Flank Steak ahead of time?

Yes, you can assemble the stuffed steak up to 24 hours in advance. Wrap the tied roll tightly in plastic wrap and refrigerate. Bring it to room temperature for 30 minutes before searing and roasting. The sauce is best made fresh, though you can prep ingredients ahead.

What’s the best way to butterfly flank steak?

Place the steak with the grain running left to right. Using a sharp knife, cut horizontally through the middle, keeping the knife parallel to the cutting board. Stop cutting about ½ inch from the opposite edge. Open like a book and pound to even thickness. If you’re uncertain, ask your butcher to butterfly it for you.

Can I use frozen spinach instead of fresh?

While fresh spinach works best, frozen spinach is acceptable in a pinch. Thaw it completely and squeeze out as much moisture as possible using cheesecloth or a clean kitchen towel. You’ll need about 10 ounces of frozen spinach to equal 3 cups of fresh. However, the texture won’t be quite as vibrant.

How do I know when the stuffed steak is done?

Use a meat thermometer inserted into the thickest part of the meat, avoiding the filling if possible. For medium-rare, aim for 135°F (57°C). For medium, cook to 145°F (63°C). Remember that the temperature rises 5-10 degrees during resting, so remove the steak slightly before reaching your target temperature.

Why did my filling leak out during cooking?

Filling leakage usually results from overfilling or loose rolling. Make sure to roll the steak tightly and secure it well with kitchen twine. Additionally, leaving adequate border space prevents filling from escaping at the edges. Press excess moisture from the vegetables before filling to reduce leakage risk.

Can I make this recipe with a different cut of beef?

Yes, other cuts work with this preparation method. Skirt steak is very similar to flank and works excellently. Top round can be butterflied and stuffed, though it may be slightly less tender. Sirloin tip also butterflies well and offers good flavor. Adjust cooking times based on the thickness and characteristics of your chosen cut.

What can I substitute for heavy cream in the sauce?

Half-and-half creates a lighter sauce, though it won’t be as rich. For an even lighter option, use whole milk thickened with a cornstarch slurry (1 tablespoon cornstarch mixed with 2 tablespoons cold milk). Coconut cream offers a dairy-free alternative, though it adds subtle coconut flavor. Greek yogurt stirred in at the end creates tanginess, but don’t let it boil.

How thin should I pound the butterflied steak?

Aim for an even thickness of about ½ inch throughout. This ensures uniform cooking and makes rolling easier. Don’t pound it so thin that it tears or develops holes. Use gentle, even strokes with your meat mallet, working from the center outward.

Can I cook this entirely on the stovetop?

While the recipe calls for finishing in the oven, you can cook it entirely on the stovetop. After searing all sides, reduce heat to medium-low and cover the pan. Cook for 20-25 minutes, turning occasionally, until the internal temperature reaches your desired doneness. However, oven finishing provides more even cooking.

What should I do if my Gouda, Spinach and Mushroom Stuffed Flank Steak is too salty?

If the finished dish tastes too salty, serve it with unsalted side dishes to balance the flavors. Starchy sides like plain rice or potatoes help absorb excess salt. For future preparations, use low-sodium beef broth and go lighter on salt during initial seasoning. You can always add more salt at the table.

Conclusion

Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce delivers restaurant-quality results at home. This impressive dish combines tender beef with a flavorful filling and luxurious sauce. Moreover, the technique is more accessible than it appears.

The combination of smoky Gouda, earthy mushrooms, and fresh spinach creates perfect harmony. Each component enhances the others without competing for attention. Furthermore, the mushroom cream sauce ties everything together beautifully.

This recipe works equally well for special occasions and elevated weeknight dinners. The presentation impresses guests, while the flavors satisfy everyone at the table. Additionally, the leftovers taste excellent the next day.

Master the basic technique and you’ll find endless variations possible. Different cheeses, vegetables, and seasonings create entirely new dishes. Moreover, the rolling method transfers to other proteins beyond beef.

Try this Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce for your next dinner. The combination of flavors and textures makes it a memorable meal. Start with quality ingredients and follow the steps carefully for the best results.

Ready to impress your dinner guests? Gather your ingredients and create this stunning stuffed flank steak tonight. Your kitchen will smell amazing, and your family will request it again and again!

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Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce


  • Author: Stephanie

Description

Gouda, Spinach and Mushroom Stuffed Flank Steak with Mushroom Cream Sauce

Ingredients

For the Stuffed Flank Steak:

  • 1.5 pounds flank steak

  • Kosher salt and freshly-cracked black pepper

  • 1 teaspoon smoked paprika

  • 2 sprigs fresh rosemary leaves

  • 1 tablespoon extra-virgin olive oil

  • 6 ounces cremini mushrooms, thinly sliced

  • 1 shallot, finely chopped

  • 4 cloves garlic, finely chopped

  • 1 red finger chile, thinly sliced

  • 1/2 pound baby spinach

  • 8 ounces Gouda cheese, sliced into 1/4-inch thick sticks

  • 2 tablespoons avocado oil

For the Mushroom Cream Sauce:

  • 2 tablespoons unsalted butter

  • 2 ounces cremini mushrooms, thinly sliced

  • 1/2 shallot, finely chopped

  • 1 clove garlic, finely chopped

  • Kosher salt and freshly-cracked black pepper, to taste

  • 1.5 cups beef broth

  • 2 teaspoons Dijon mustard

  • 1/4 cup half & half cream

Instructions

Prepare the Flank Steak:

  1. Using a sharp knife, butterfly the flank steak lengthwise, parallel with the fibers of the meat, stopping just before slicing through the opposite side

  2. Open the steak like a book and season the sliced side with salt, pepper, smoked paprika, and rosemary

  3. Cover with plastic wrap and flatten with a meat mallet until 1/4-inch thick all over

  4. Transfer to the fridge, covered, and marinate 1 to 4 hours

Make the Filling:

  1. Preheat a large, oven-safe skillet over medium heat

  2. Add olive oil and heat until shimmering

  3. Add mushrooms and cook undisturbed until golden brown, about 3 minutes

  4. Add shallots, garlic, and chiles, season with salt and pepper

  5. Cook, stirring, until fragrant, about 1 minute

  6. Add spinach and cook until wilted with very little moisture remaining, about 3 minutes

  7. Transfer to a bowl and let cool completely

Stuff and Cook the Steak:

  1. Preheat oven to 400°F

  2. Remove steak from fridge and spread vegetable mixture evenly over it

  3. Position Gouda sticks along the narrower end and tightly roll the steak with the grain

  4. Tie with butcher’s twine every 2 inches and once lengthwise

  5. Wipe skillet clean and place over medium-high heat

  6. Add avocado oil and brown the steak on all sides, about 12 minutes total

  7. Transfer to oven and cook until internal temperature reaches 135°F for medium-rare

  8. Cover with foil and keep warm while making the sauce

Make the Mushroom Cream Sauce:

  1. Place the same pan over medium heat and add butter

  2. Add mushrooms and cook undisturbed until golden brown, about 3 minutes

  3. Add shallots and garlic, season with salt and pepper, cook 1 minute

  4. Add beef stock and mustard, cook until reduced by 1/4 in volume

  5. Add cream and stir to combine, taste and adjust seasoning

Serving:

  1. Slice the flank steak between each piece of twine

  2. Transfer to a serving platter and spoon the mushroom cream sauce over top

  3. Serve with mashed potatoes or sautéed vegetables

This elegant stuffed flank steak creates beautiful pinwheel slices when cut, revealing the melted Gouda cheese and savory mushroom-spinach filling. The rich mushroom cream sauce complements the dish perfectly, making it ideal for special occasions or dinner parties.