Generally steam for 20-30 minutes.

The crabs eaten at home are mainly steamed. When steamed, the crab struggles due to the heat. When steamed to death, the abdomen is downward, and the yellow paste flows out, losing a lot of nutrients. The brain must be destroyed with a needle in advance to paralyze it. When steaming, the abdomen can be upward so that the yellow paste will not be lost. Generally steam for 20-30 minutes. Paragonimiasis cysts are parasitic in crabs. If they are not cooked thoroughly, they are susceptible to paragonimiasis after eating. If you want to eat it immediately, you can steam it as much as you want. It is best not to eat any leftover crabs.

Extended information:

Be careful when eating crabs:

1. Buy crabs to see their vitality. Don’t eat dead crabs. Even if they are cooked, they are not good for your health. The stiffness and autolysis periods after death of river crabs are greatly shortened. Bacteria in the crabs will multiply rapidly and spread into the crab meat, causing vomiting, abdominal pain, and diarrhea in the eater. When buying crabs, you can tease the crab's eyes or turn the crab over. If it can flip back quickly, it means it is energetic.

2. Before eating crabs, you can soak them in light salt water to spit out sewage and impurities. Wash them before cooking.

3. The gills and stomach of crabs cannot be eaten. Open the crab shell. The soft gray-white strips on both sides are the gills, which should be removed and discarded. The triangular shape in the front half of the crab shell, under the eyes, is the stomach. Carefully separate and remove it.

4. Don’t eat leftover crabs. Crab meat is prone to spoilage, so it is best to steam it immediately and avoid eating leftover crab.

5. Crabs cannot be eaten with tea or persimmons. Do not drink tea when eating crabs and within 1 hour after eating crabs. Tea will solidify some components of crab, which is not conducive to digestion and absorption, and may also cause abdominal pain and diarrhea. The tannic acid and other ingredients in persimmons will coagulate the crab meat protein. If the coagulated material remains in the intestine for a long time, it will ferment and go rancid, causing vomiting, abdominal pain, diarrhea, and may also cause stone disease.