Beef Wellington | Publix Super Markets

Ingredients

• 1 sheet frozen puff pastry
• 3 tablespoons unsalted butter, divided
• Nonstick aluminum foil
• 2 1/2 lb center-cut beef tenderloin
• 1/4 teaspoon kosher salt
• 1/8 teaspoon pepper
• 8 oz sliced fresh white mushrooms
• 8 oz diced fresh yellow onions
• 2 tablespoons all-purpose flour, for dusting
• 1/4 cup egg substitute (or 1 large egg)