1. To make sweet and sour fish, you must first choose the right fish, so when choosing fish, you should choose the fish that looks plump and fleshy. This kind of fish is more resistant to frying and cooking, so that it won't dry once it is put in the oil pan. You can choose grass carp, carp and so on. Moderate size, fresh and tender meat, thick and elastic. Don't choose Wuchang fish and cod.
2. Carps are generally divided into male and female. It is best to choose male carp when buying, because the meat of male carp is fat and beautiful.
3. Clean up the fish in advance, remove the scales, gills and internal organs, especially the black film in the belly of the fish, which are the sources of fishy smell.