→ Beef
01 - 1 center-cut beef tenderloin, trimmed, weighing approximately 2 to 2.5 lb
02 - Salt, to taste
03 - Freshly ground black pepper, to taste
04 - 2 tbsp olive oil
→ Mushroom Duxelles
05 - 1 lb cremini or button mushrooms, finely chopped
06 - 2 tbsp unsalted butter
07 - 2 shallots, finely minced
08 - 2 cloves garlic, minced
09 - 2 tsp fresh thyme leaves, chopped
10 - Salt, to taste
11 - Black pepper, to taste
→ Assembly
12 - 8 to 10 thin slices prosciutto
13 - 2 tbsp Dijon mustard
14 - 1 lb puff pastry, thawed if frozen
15 - 1 egg, beaten (for egg wash)
16 - All-purpose flour, for dusting
→ Optional
17 - 1 tbsp fresh parsley, chopped (for garnish)