Beef tongue is the tongue of a cow. It is very high in fat which makes it super nutritious when it comes from a grass-fed animal. Tongue is often seasoned with onion and other spices, and then placed in a pot to boil. After it has cooked the skin is removed. Another way of preparing tongue is to scald it in hot water and remove the skin. Then roast the tongue in an oven, using the pan drippings to prepare a gravy. U.S. raised grass-fed beef.