syūn mùih tōng
酸梅 is sour plum and 湯 is soup, so 酸梅湯 is sour plum soup.
Sour plum drinks are made with sour plums, rock sugar, and other ingredients such as dried osmanthus and hawthorn. It's typically served cold as a popular summer drink.
soup
soup of the day
hot and sour soup
egg drop soup
oxtail soup