Hot water should be used to steam the omelet, not cold water. It is better to use warm water or cold water. When steaming custard, if cold water is used, the taste of custard will not be tender enough and will be too hard. But if you use boiled water, because the water temperature is too high, it will turn into egg flowers as soon as you put it in the egg liquid, so it is best to use warm water, usually about five minutes, which will neither affect the taste nor destroy the nutrition. The best way to steam the omelet is to boil a pot of water first, not directly, but through the water. Boil the water first, then put the egg liquid on it, and then turn on a small fire to leave a gap. The custard steamed in this way will never have honeycomb eyes and will not taste old.