Hot water in the pot. Because the egg is easier to cook, usually steamed for about 5 minutes taste better, but also will not destroy the nutrition. Boil a pot of water to put on the steam compartment, the water must boil and then put the egg on the steam compartment and then open a small fire, the lid of the pot must leave a gap, don't cover tightly, the best way to add a lid to the bowl when steaming custard.