Ingredients
- 1 (about 16-ounce) package frozen puff pastry, preferably all-butter
- 2 medium shallots
- 2 cloves garlic
- 1/4 bunch fresh thyme
- 1 pound cremini mushrooms
- 1 (about 2 1/2-pound) center-cut beef tenderloin roast
- 2 1/4 teaspoons kosher salt, divided
- 1/2 teaspoon freshly ground black pepper
- 2 tablespoons vegetable oil
- 2 tablespoons unsalted butter
- 6 to 8 cold slices prosciutto (about 5 ounces)
- 1 large egg
- All-purpose flour, for dusting
- Flaky salt, for serving (optional)
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