Tom Yum Goong 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, chilis, lime juice, mushrooms and tomatoes. This potent herbal mixture is well known for its medicinal properties.