1-1/4 cups steak sauce
1 cup unsalted butter, melted
2-3/4 teaspoons garlic powder
2-3/4 teaspoons onion powder
2-3/4 teaspoons black pepper
2 teaspoons ground white pepper
1 teaspoon ground red pepper
15 lbs. flank steak or London broil
Prepare grill or turn on broiler.
Combine steak sauce and butter in a bowl.
Combine remaining ingredients, except meat, in another bowl.
Brush both sides of steaks with sauce. Sprinkle with seasonings.
Grill or broil 4 inches from heat 4-5 minutes per side. Serve with remaining sauce.