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London broil is a North American beef dish made by broiling or grilling marinated flank steak, then cutting it across the grain into thin strips. The origin of the name is obscure; ironically, the dish is unknown in the English city of London.
The cut 
Many American butchers will label a cut of meat "London broil". This is confusing as the term does not refer to a specific cut of meat, but a method of preparation and cookery. The cut of meat traditionally used is flank steak, but in recent years butchers have labeled top round steak/roast as London Broil.
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. In both heating methods the meat is placed approximately three inches from a direct heat source and turned several times to promote even cooking and avoid burning. It is then served in thin slices, cut on a horizontal diagonal across the grain. Because the muscle fibers run the entire length of this cut, the meat can be tough if not tenderized via pounding or massaging. Scoring, stabbing, cutting, penetrating, or otherwise mutilating the cut before sending it into the broiler results in a tougher finished product as it allows desirable juices to run out of the meat into the pan. Cooking the flank steak sous-vide for 48 hours before a quick broil will tenderize the meat and retain juiceness.
In Canada 
In parts of Southern Canada, a ground meat patty wrapped in flank or round steak is known as a London broil. Some butchers will wrap the flank steak around a concoction of seasoned and ground or tenderized flank steak. Others sell a pork sausage patty wrapped in flank or top round steak labeled as London broil. Another variant, popular in Ontario, is a London broil "loaf", wherein the tenderized flank steak exterior is wrapped around minced and spiced veal as the filler. In some regions, bacon will be added between the flank steak and the veal grind.
- E.g., Zehrs Grocers in the GTA
- E.g., Goeman's Lakeshore Meats in St. Catharines, Ontario, Canada
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