Tom yum (also spelled tom yam) is one of the most popular dishes in Thailand. The original recipe of this clear, spicy and sour soup comes from northeastern Thailand and Laos. Its ever-growing popularity in Thailand and Southeast Asia has seen the original recipe slightly modified, depending on the region it is prepared in. The favoured tom yum in Samui is obviously prepared with seafood and shrimps added to required fresh ingredients such as lemongrass, galangal, lime juice, fish sauce, kaffir lime leaves, and crushed chili peppers. When ordering tom yum in a restaurant, be aware that the Thai version of this soup is very spicy, so it is best to ask for a mildly-spiced version of this flavourful dish.