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Ingredients

Serves 6 to 8

• 1 2 1/2 to 3-pound beef tenderloin, trimmed of excess fat
• 2 teaspoons coarse salt
• 1/2 teaspoon freshly ground pepper
• 2 tablespoons unsalted butter
• 1 small onion, finely chopped
• 1 pound white mushrooms, stems removed, finely chopped
• 1/4 cup dry sherry
• All-purpose flour, for dusting
• 1 pound frozen puff pastry, thawed, plus more for garnish if desired
• 1/4 pound (4 ounces) duck liver, chicken liver, or peppercorn mousse, room temperature
• 1 large egg, lightly beaten
• Sea salt, or coarse salt, for sprinkling (optional)

Description

Look For Duck Liver, Chicken Liver, Or Peppercorn Mousse In Specialty-food Shops.

Martha Stewart