Looking at the components of the character 湯, 氵 is the radical for water (if you see this on a character, it probably has to do with something liquid).
Ordering
碗 is bowl and a classifier, so 一碗湯 (yāt wún tōng in Cantonese, yì wǎn tāng) is one bowl of soup.
Soup is prevalent in Chinese cuisine, including many noodle soups and soups served as desserts.