To serve 6-8 people, brush 4 pounds sirloin steak with a mixture of 2 tablespoons melted butter, 1 teaspoon Worcestershire sauce, 1 teaspoon salt and 1/4 teaspoon pepper. Place brushed side of steak down on barbecue grill. Cook steak for 10 minutes. Brush steak with remaining butter mixture. Turn steak over and cook for 10 more minutes or until desired degree of doneness.