Red Door Beef Wellington | Mama's Cooking

Ingredients

• 1 (2-3-pound) beef tenderloin
• salt, to taste
• pepper, to taste
• 2 tablespoons olive oil
• 1 (16-ounce) carton mushrooms
• 3 cloves garlic
• 1/4 cup onion, chopped
• 6-8 slices prosciutto
• 3 tablespoons yellow mustard
• flour, to taste, for dusting the work surface
• 1 sheet frozen puff pastry (from a 17.3-ounce, 2-count box), thawed
• 2 eggs, beaten