Tom Yum Goong (Thai Spicy Soup with Prawns) is the name given to a very popular Thai soup that is hot, spicy and sour. It is made with prawns. It gives a delicious and unusual taste of being hot whilst slightly sour. The basic ingredients are lemongrass, galangal, kaffir lime leaves, fish sauce, red chillies, Thai chilli paste, lime juice, mushrooms and tomatoes.