London broil needs about four to five minutes in the broiler per side. It's important to preheat the oven and the pan for about 10 minutes before adding the meat.
London broil is not really a cut of meat, but a style of cooking. London broil uses tougher and cheaper cuts of meat, such as top round steak, and broils them under high heat to make them tender.
London broil should be marinated overnight before cooking for best results. Marinades that use ingredients such as lemon juice, wine, soy sauce and citrus fruits help break down the muscle fibers in the meat and make for a more tender dish. The meat is traditionally cut across the grain into thin slices before serving with a side dish for a budget-friendly dinner.