Beef Wellington

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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