Tom yum, or tom yam, is an iconic hot and sour soup from Thailand. It is derived from two Thai words: tom refers to the boiling process and yam means mixed. Tom yum soup is richly fragrant and flavorful with a base made from lemongrass, kaffir lime leaves, galangal, fish sauce, lime juice, and peppers. This soup mix allows anyone to make delicious and authentic tom yum soup by just adding water and a mixture of vegetables, meats, and seafood. Tom yum is especially good with shrimp or pork.