1, dead crabs generally don't fall off, and live steamed crabs will fall off because they struggle.

2. If you want to keep the delicious steamed food and don't want to lose your leg, just kill it before steaming.

3. Before steaming, insert a knife in the middle of its eyes, or poke a thick metal needle in the middle of the crab's foaming 1 cm, and then stir it left and right, so that it won't fall off when steaming.

4. Kill the crab completely. This way, you won't feel the external stimulus. You wouldn't have lost your leg.