INGREDIENTS
1
center-cut beef tenderloin, center-cut
12
thin slices Prosciutto
1 1/2 lb
Mushrooms, mixed
1
Shallot
1
Thyme, Leaves from sprig
1
Egg, large
2 tbsp
Dijon mustard
1
Black pepper, Freshly ground
1
Flour
1
Kosher salt
1
Salt, Flaky
1
Olive oil
14 oz
Puff pastry, frozen
2 tbsp
Butter, unsalted