The big blue crab can be steamed for about 15 minutes, and the small blue crab can be steamed for about 10 minutes. Don't open the crab when steaming, steam it thoroughly at one time, otherwise it will affect the taste. Steamed crabs need vinegar, soy sauce, cooking wine, sugar, salt, sesame oil, ginger and so on. Make dipping sauce.

The head and breastplate of the blue crab are oval, the back is round, the surface is smooth and the claws are thick. The color of crustaceans varies with species and living environment.

Blue crabs are widely distributed in the Pacific Ocean and Indian Ocean, mainly preying on small fish, shrimp, crabs, shellfish and so on. They burrow in caves during the day and eat at night.

Blue crabs like to inhabit mudflats, mangroves or marshes in the intertidal zone, and their shells are dark green, yellow green and olive green.