# 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 oz), thawed if frozen
13 - 1 large egg, beaten for egg wash
14 - Flour for dusting
# Step-by-Step Guide:
01 - Preheat oven to 425°F. Season beef tenderloin generously with salt and pepper. Heat vegetable oil in a heavy skillet over high heat until smoking. Sear beef on all sides for approximately 2 minutes per side until deeply browned on all surfaces. Transfer to a plate and allow to cool completely.
02 - In the same skillet, melt butter over medium heat. Add minced shallots and garlic, sauté for 1 minute until fragrant. Add chopped mushrooms and thyme, season with salt and pepper. Cook for approximately 10 minutes, stirring occasionally, until all moisture has evaporated and the mixture reaches a paste-like consistency. Transfer to a bowl and cool completely.
03 - Lay a large sheet of plastic wrap on a work surface. Arrange prosciutto slices in slightly overlapping layers to form a rectangle slightly larger than the beef dimensions. Spread cooled mushroom duxelles evenly across the prosciutto layer.
04 - Brush the cooled beef tenderloin with Dijon mustard on all sides. Place beef in the center of the duxelles-covered prosciutto. Using the plastic wrap as an aid, tightly roll the prosciutto and mushrooms around the beef to form a compact log. Twist the plastic wrap ends to seal and refrigerate for 20 minutes.
05 - Roll out puff pastry on a floured work surface to a rectangle large enough to completely encase the beef. Unwrap the beef from plastic wrap and position in the center of the pastry. Fold pastry edges over the beef, trimming excess dough. Seal edges by pressing firmly. Transfer seam-side down onto a parchment-lined baking sheet.
06 - Brush the entire pastry surface with beaten egg wash. Decorate with pastry cutouts if desired. Refrigerate for 10 minutes before baking.
07 - Bake for 40 to 45 minutes until pastry is golden brown. Insert an instant-read thermometer into the thickest part of the beef. Target 120°F for rare or 130°F for medium-rare. Remove from oven when pastry reaches deep golden color.
08 - Allow the beef wellington to rest on the baking sheet for 10 to 15 minutes before slicing. This redistribution of juices ensures optimal tenderness and flavor. Slice into portions and serve immediately with red wine sauce or pan jus.