Grill Mates Montreal Steak Steakhouse Burgers Sauce Mix-In is a robust blend of coarsely ground black pepper, garlic and spices. Made with McCormick spices, our Montreal Mix-In delivers juicy burgers packed with flavor. Take your rightful place as master of the grill -- simply add one package of mix-ins per pound of ground meat for a steakhouse-quality burger that no one will turn down.