Cambodia
Samlor machu pkong or "Sour Shrimp Stew" is a Cambodian sour soup flavored with lemon, chilis, prawns and/or shrimp. One of the most popular sour soups in Cambodia, it is eaten most often on special occasions.
Samlar machu yuan or "Vietnam sour soup" is another common hot and sour soup of Cambodia originating among the Khmer Krom of the Mekong Delta region (hence, the name). It is made with fish, usually mudfish, walking catfish or tilapia, that has first been fried or broiled then added to the broth. Chicken may also be substituted. The ingredients which give the stew its characteristic flavor may vary depending on what is available locally to the cook. Possible ingredients include various combinations of pineapple, tomato, ngo gai, fried garlic, papaya, lotus root, Thai basil (Khmer: ជីក្រហម) and Thai chili.
Read more about this topic: Hot And Sour Soup, Southeast Asia