# Components:
→ Beef
01 - 6 beef filet medallions, 2–3 oz each, about 1.5 inches thick
02 - Salt, to taste
03 - Freshly ground black pepper, to taste
→ Mushroom Duxelles
04 - 8 oz cremini or button mushrooms, finely chopped
05 - 1 small shallot, finely minced
06 - 2 cloves garlic, minced
07 - 2 tablespoons unsalted butter
08 - 1 tablespoon fresh thyme leaves, chopped
09 - Salt and freshly ground black pepper, to taste
→ Assembly
10 - 1 sheet all-butter puff pastry (about 14 oz), thawed if frozen
11 - 3 oz prosciutto, thinly sliced
12 - 1 large egg, beaten (for egg wash)
13 - All-purpose flour, for dusting
# Directions:
01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - Season both sides of the beef medallions generously with salt and freshly ground black pepper.
03 - Heat a heavy skillet over high heat until very hot. Add a small amount of oil if desired and sear the medallions 1 minute per side until well browned on the exterior but still rare inside. Transfer to a plate and refrigerate or let cool completely.
04 - Wipe the skillet clean, reduce heat to medium, melt the butter, then add the shallot and garlic and sauté 1 minute. Add the finely chopped mushrooms and thyme, season with salt and pepper, and cook, stirring frequently, until all moisture has evaporated and the mixture is dry, about 8 minutes. Cool completely.
05 - On a lightly floured surface, roll the puff pastry to approximately 1/8 inch thickness. Cut the sheet into 6 squares large enough to fully enclose each medallion.
06 - On each pastry square lay a slice of prosciutto, spread about 1 tablespoon of cooled mushroom duxelles over the prosciutto, then place one cooled beef medallion on top.
07 - Fold the pastry up and over the medallion, pressing seams to seal and trimming excess dough. Place each parcel seam-side down on the prepared baking sheet. Use trimmed dough to create decorative shapes if desired.
08 - Brush each parcel all over with the beaten egg to ensure a glossy, golden finish. Brush any decorative pastry pieces as well.
09 - Bake in the preheated oven until pastry is golden brown and crisp, about 18 to 20 minutes. Remove from oven and let rest 5 minutes before serving.
