A flank steak that has been cut into large pieces, tenderized by marinating, broiled or grilled, then sliced into thin strips across the grain before it is served.
London broil is a beef dish originating in North America and made by broiling or grilling marinated flank steak. The London broil is then cut across the grain into thin strips. It is often served with a sauce, sometimes with Mushroom Gravy or with ketchup. The dish is unknown in London, England and the name likely originates from a New York steakhouse in the early 19th century, seeking to give an international flair to its American menu.
Leftover London broil may be used to make Steak Tips or Thumb Bits, pairing the meat with a flavorful sauce.