Wiktionary
tangbao
n. (context Chinese cuisine English) soup dumplings, any of a variety of Chinese dumplings filled with soup.
Wikipedia
Tangbao
Tangbao or soup buns are a large, soup-filled type of steamed buns ( baozi) in Chinese cuisine. They are also sometimes known as guantang bao or soup-filled buns. Various varieties are found, with some name variations in various parts of the country. All of these buns are made by wrapping a gelatinous filling in dough, which is then steamed to melt the filling into soup.