Twenty minutes or more
Boiling water can be boiled for twenty minutes, if it is a larger crab, you can extend the steaming time a little longer, to ensure that the parasitic eggs will be completely eliminated. Steaming crab retains the essence of the original flavor, so it is very popular with foodies, steaming seems simple, in fact, there is a lot of care, fire, time need to master, otherwise it will destroy the crab's delicious. Steam crabs before, first with a small brush to clean the crab shells and crab legs, and put into the water to raise half a day, so that it row net abdominal dirt Tip: Steam can be used before the first will be the right amount of white wine poured on the live crabs slightly marinated, taste better.
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People's Daily Online - How long to cook crabs How to Steam Crabs