Tang Bao can refer to XiaoLongBao in Shanghai, but more often as the name of a big soup-filled dumpling. It is a bun with soup inside. You do not find much stuffing like the common meat/vegetable buns. A popular kind of Tang Bao is with crab meat or crab roe inside. You can break a small hole on the skin or put a straw on top for the soup. Either way, be aware of the hot soup.