2 filet mignon (6 oz / 170 g each), tied if needed Salt and freshly ground black pepper to taste 1 tbsp neutral oil 2 tbsp unsalted butter 8 oz / 225 g cremini or button mushrooms, very finely chopped 1 small shallot, minced 2 tsp fresh thyme leaves 4 thin slices prosciutto 2 tsp Dijon mustard 1 sheet puff pastry, thawed 1 egg yolk + 1 tsp water (egg wash)
1. Season steaks; sear in hot oil 1–2 minutes per side. Cool, then brush with Dijon; chill 10 minutes. 2. In butter, sauté mushrooms, shallot, and thyme over medium until dry and concentrated, 8–10 minutes. Cool completely (duxelles). 3. On plastic wrap, lay 2 prosciutto slices overlapping. Spread half the duxelles; place a steak on top. Roll tightly; twist ends to secure. Repeat; chill 15 minutes. 4. Cut puff pastry in two squares. Unwrap each steak; place on pastry and wrap, sealing edges. Brush with egg wash; chill 10 minutes. Heat oven to 400°F/200°C. 5. Score tops lightly; bake 18–22 minutes to golden and 125–130°F internal for medium-rare. Rest 10 minutes before serving.
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