London broil is a beef broil filet mignon in oven made by broiling marinated beef, then cutting it across the grain into thin strips. Despite its name, the dish and the terminology are North American, not British. London broil” originally referred to broiled flank steak, although modern butchers may label top round, coulotte, or other cuts as “London broil”, and the term has come to refer more to a method of preparation and cookery than to a specific cut of meat. The preparation of London broil typically involves marinating the meat for several hours followed by high heat searing in an oven broiler or outdoor grill.