What’s for dinner tonight? Something so luxurious you’ll have to double check to make sure you are in fact in your home and also not dreaming. That’s just how tasty Stuffed Beef Tenderloin is. It’s so tender, so juicy, so perfectly filled with the melty cheese and spinach that you’ll question your reality because it’ll taste too good to be true. Oh, but friend, it’s totally real and the buttery, tangy, fancy mushroom sauce on top is the perfect proof. Stuffed Beef Tenderloin brings you 5-star restaurant quality at home and is truly out-of-this-world. You’ll just have to keep tasting it to see!
Ingredients
For the beef:
- 3 tablespoons unsalted butter
- 2 medium leeks, thinly sliced
- 1 clove garlic, minced
- 3 tablespoons all-purpose flour
- 1 cup heavy cream
- 3 (10-ounce) packages frozen chopped spinach, thawed
- 1 ounce Parmigiano-Reggiano cheese, grated
- 2 teaspoons fresh lemon juice
- 1/4 teaspoon whole nutmeg, grated
- 2 teaspoons kosher salt, divided
- 1 teaspoon black pepper, divided
- 1 (4-pound) beef tenderloin, trimmed
- 1 tablespoon extra-virgin olive oil
For the sauce:
- 2 tablespoons unsalted butter, divided
- 1 tablespoon olive oil
- 2 (8-ounce) packages cremini mushrooms, quartered
- 1 medium shallot, minced
- 1/2 cup dry red wine
- 1 cup beef broth
- 1 tablespoon Dijon mustard
- 1/2 teaspoon fresh rosemary, chopped
- 1/2 teaspoon kosher salt
- 1/4 teaspoon black pepper
Directions
Step 1 –Preheat the oven to 350 degrees F.
Step 2 –In a medium, straight-sided saucepan over medium heat, melt 3 tablespoons of the butter.
Step 3 –Add the leeks and the garlic to the butter and cook, stirring occasionally, until the leeks have softened, about 4 minutes.
Step 4 –Add the flour to the leek mixture and cook, whisking constantly, for 3 minutes.
Step 5 –Whisk the heavy cream into the leek mixture until smooth.
Step 6 –Add the spinach to the leek mixture and cook, stirring occasionally, until it is very thick, about 5 minutes.
Step 7 –Stir the cheese, the lemon juice, the nutmeg, 1 teaspoon of the salt, and 1/2 teaspoon of the pepper into the spinach mixture and transfer the saucepan away from the heat.
Step 8 –Let the spinach mixture cool for 10 minutes.
Step 9 –While the spinach mixture is cooling, use a sharp knife to make a horizontal cut through the center of the beef, cutting to, but not through, the other side. The cut should be within 1/2-inch of the other side.
Step 10 –Open the top cut piece (as you would a book) and lay it flat.
Step 11 –Place 1 sheet of plastic wrap on a flat surface and place the meat on top. Top the meat with another piece of plastic wrap.
Step 12 –Using the flat side of a meat mallet or the back of a small, heavy skillet, pound the meat to 1/2-inch thickness and into a 13-inch square.
Step 13 –Remove the plastic wrap and spread the spinach mixture evenly over the beef, leaving a 1 1/2-inch border around the edges.
Step 14 –Roll the beef and tie with kitchen twine, securing it at 2-inch intervals.
Step 15 –Brush the meat evenly with 1 tablespoon of the olive oil and sprinkle with 1 teaspoon of the salt and 1/2 teaspoon of the pepper.
Step 16 –Place the rolled beef on a wire rack and set it over a rimmed baking pan.
Step 17 –Bake the beef for 30 minutes.
Step 18 –Increase the oven temperature to 450 degrees F and bake until the beef’s internal temperature reaches 135 degrees F, about 20 minutes.
Step 19 –Transfer the meat from the oven and let it stand for 30 minutes.
Step 20 –While the meat rests, melt 1 tablespoon of the butter with the remaining oil in a large skillet over medium-high heat.
Step 21 –Add the mushrooms to the butter mixture and cook, stirring once or twice, until they are lightly browned, about 5-6 minutes.
Step 22 –Add the shallot to the mushrooms and cook, stirring constantly, until the shallot is tender, about 1-2 minutes.
Step 23 –Stir the wine into the mushroom mixture and cook, stirring constantly, for 2 minutes.
Step 24 –Stir the broth into the wine mixture, then lower the heat to medium and simmer, stirring constantly, for 5 minutes.
Step 25 –Stir the mustard, the rosemary, the remaining salt, and the remaining pepper into the sauce mixture and cook for 1 minute.
Step 26 –Transfer the sauce from the heat and stir in the remaining butter until combined.
Step 27 –Serve the beef with the sauce.
