# What You’ll Need:
→ Beef
01 - 2 lb beef tenderloin, trimmed
02 - Salt and freshly ground black pepper to taste
03 - 2 tablespoons vegetable oil
→ Mushroom Duxelles
04 - 1 lb cremini or button mushrooms, finely chopped
05 - 2 shallots, minced
06 - 2 cloves garlic, minced
07 - 2 tablespoons unsalted butter
08 - 2 tablespoons fresh thyme leaves, chopped
09 - Salt and pepper to taste
→ Assembly
10 - 10 slices prosciutto
11 - 2 tablespoons Dijon mustard
12 - 1 sheet puff pastry, 14 ounces, thawed if frozen
13 - 1 large egg, beaten for egg wash
14 - Flour for dusting
# Directions:
01 - Preheat oven to 425°F
02 - Season beef tenderloin with salt and pepper. Heat vegetable oil in a heavy skillet over high heat. Sear beef on all sides for approximately 2 minutes per side until deeply browned. Remove from skillet and allow to cool completely.
03 - In the same skillet, melt butter over medium heat. Add minced shallots and garlic, sauté for 1 minute. Add chopped mushrooms and thyme, season with salt and pepper, and cook until all moisture has evaporated and mixture achieves paste-like consistency, approximately 10 minutes. Cool completely.
04 - Lay plastic wrap on work surface. Arrange prosciutto slices in slightly overlapping pattern to form rectangle slightly larger than beef dimensions.
05 - Spread cooled mushroom duxelles evenly across prosciutto layer.
06 - Brush cooled beef tenderloin with Dijon mustard. Place beef in center of duxelles-covered prosciutto.
07 - Using plastic wrap as guide, roll prosciutto and mushroom layer tightly around beef into compact log. Twist plastic wrap ends to seal. Refrigerate for 20 minutes.
08 - Roll out puff pastry on floured surface to rectangle large enough to completely encase beef parcel. Unwrap beef from plastic wrap and position in center of pastry.
09 - Fold pastry edges over beef, trim excess pastry, and seal all edges. Place seam-side down on parchment-lined baking sheet.
10 - Brush pastry surface with beaten egg wash. Decorate with pastry scraps if desired. Refrigerate for 10 minutes.
11 - Bake for 40 to 45 minutes until pastry achieves golden-brown color and instant-read thermometer inserted into beef center reads 120°F for rare or 130°F for medium-rare.
12 - Remove from oven and allow beef Wellington to rest for 10 to 15 minutes before slicing and plating.