Sweet and sour fish is one of the most popular traditional Chinese dish, normally cooked with carp. The method to cook an authentic Chinese sweet and sour fish  (Tang Tsu Yu) is to use what we call Liu, meaning quick-fry. The fish should be tender inside and crispy outside. Its original flavour gets reserved while the unpleasant raw fish smell would be completely removed. Many Chinese families cook this dish on a regular basis. It is considered an universal dish that has been enjoyed by people from everywhere in China for months.