Canh chua (, sour soup) or cá nấu ("cooked fish") is a Vietnamese sour soup indigenous to the Mekong Delta region of Southern Vietnam (Note, Northern and Central Vietnam also have their own canh chua). It is typically made with fish from the Mekong River Delta, pineapple, tomatoes (and sometimes also other vegetables such as đậu bắp or dọc mùng), and bean sprouts, in a tamarind-flavored broth. It is garnished with the lemony-scented herb ngò ôm (Limnophila aromatica), caramelized garlic, and chopped scallions, as well as other herbs, according to the specific variety of canh chua; these other herbs may include rau răm (Vietnamese coriander), ngò gai (long coriander), and rau quế (Thai basil). It can be served alone, with white rice, or with rice vermicelli. Variations can include prawns, squid, spare ribs, fish cakes and quail eggs. The sour taste of the soup comes from tamarind, which is mixed with a small amount of hot water; the mixture is then stirred for a few moments to release all the essence, and the liquid (minus the tamarind seeds and other solids, which are discarded) is then added to the soup. When made in style of a hot pot, canh chua is called lẩu canh chua. Varieties Canh chua me - made with tamarind; includes most varieties of canh chua Canh chua me đất or canh chua rau nhút - made with water mimosa (Neptunia oleracea) Canh chua cá - made with fish Canh chua đầu cá - made with fish heads Canh chua cá lóc - made with snakehead fish Canh chua cá bông lau - made with Pangasius krempfi catfish Canh chua cá lăng - made with Hemibagrus catfish Canh chua cá ngát - made with Plotosus catfish Canh chua cá trê - made with airbreathing catfish Canh chua cá linh bông so đũa - made with mud carp and Sesbania grandiflora flowers Canh chua lá giang cá kèo - made with Aganonerion polymorphum leaves and mudskipper fish in the genus Apocryptes Canh chua lươn - made with eel Canh chua cá hồi - made with salmon Canh cải chua cá - made with pickled mustard greens and fish Canh chua tôm - made with shrimp Canh chua tôm rau muống or canh chua rau muống nấu tôm - made with shrimp and water spinach (Ipomoea aquatica) Canh chua thơm nấu tép or canh chua thơm nấu với tép