To dry steam the midges, steam them over low heat for 15 minutes. Midges generally refer to blue crabs (scientific name: Scyllaserrata), which belongs to the Crustacea and the family Portunidae (Scyllidae). They like to live in burrows in the muddy bottoms of shallow seas and estuaries near the coast. They are ferocious and carnivorous, and their staple food is fish, shrimp and shellfish. The meat is delicious, rich in nutrients, and has the effect of nourishing and strengthening the body. Especially female crabs that are about to become pregnant will produce red or yellow paste in their bodies. This kind of paste is called "paste crab" in southern China and is also known as "sea ginseng". It is abundant in warm shallow seas and is mainly distributed in the coastal areas of Zhejiang, Guangdong, Guangxi, Fujian and Taiwan, especially in Jiangsu and Zhejiang. Nutritional analysis: Green crab is rich in protein and trace elements, which has a good nourishing effect on the body.