Flank steak, also known as London broil, isn't the most tender cut of beef, but it is one of the most flavorful. The key to getting a tender flank steak is to let the meat marinate for a good, long time — in this case, in a mixture of red wine, Worcestershire sauce, garlic, various spices, and fresh rosemary — and the carve it across the grain into thin slices before serving.
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