Tongue skin should be smooth; a rough skin is an indication of age. It is sold fresh or salted, the tongue is tough and needs soaking before cooking for 2-3 hours if fresh or 8-10 hours if salted. Ox tongue has a good flavour and a pleasant texture and is also sold fresh and salted, and sometimes smoked. Calves tongues are very delicate in flavour and are usually sold fresh. Sheep tongues are smaller and, like calves tongues, are usually poached or braised and served cold, or hot with sauce.