The word tom means "boil", and som means "sour".[1]
History
The soup is typically made in northern Thailand.[2] According to Chumpol Jangprai, the Thai word "som" has traditionally been used to describe anything that is sour.[1]
The ingredients are simmered to make a broth, then often strained through a sieve or cheesecloth. Just before serving, small pieces of seafood or chicken are added and simmered just until cooked.[1][2]
Serving
Tom som soups are eaten as a meal, as part of a meal, or as aahaan kap klaem (drinking food).[2]