Generally speaking, boiling water on a big fire will be cooked in 20 minutes. If it is a big crab, the cooking time can be extended a little to ensure the complete elimination of parasitic eggs.
Matters needing attention
One: When buying crabs, you must choose live ones. Although dead crabs are cheaper than half, they may contain poison. To be on the safe side, don't be greedy for cheap.
Two: when washing crabs, in order to wash them thoroughly, you can use a clean toothbrush to brush the dead angle on the crab's stomach to prevent sediment or sludge residue.
The "five views" of carefully selecting crabs;
Look at the crab shell. All shells are dark green with light, thick and strong; The back of the shell is yellow, mostly thin.
Second, look at the navel. The navel protrudes, and a boat is fat; Most dents lack fat.
Third, look at the claws. All hairy feet are old and healthy; However, if the pliers have no fluff, the body will be soft.
Fourth, look at vitality. If you turn the crab upside down, you can turn it back quickly with a stinger, which has strong vitality and can be preserved; Irreversible vitality is poor and cannot be preserved for a long time.
Fifth, look at men and women. Female crabs are picked in August and September in the lunar calendar, and male crabs are selected after September, because the gonads of male and female crabs are mature and the taste and nutrition are the best.