Beef tongue is a cut of beef made of the tongue of a cow. It can be boiled, pickled, roasted or braised in sauce. Known for its unique texture and tenderness, beef tongue is often prepared by boiling, braising, or slow-cooking until it becomes flavorful and easy to slice. It is found in many national cuisines, and is used for taco fillings in Mexico and for open-faced sandwiches in the United States.