1. After the eggs are cooked in cold water, it usually takes 7 to 9 minutes to be fully cooked.

It is best to soak the eggs in cold water for a while before boiling them. Water must not be soaked in eggs, otherwise protein will not solidify easily where the water is not soaked, which will affect digestion; Soak the eggs in cold water for a while to reduce the air pressure in the eggs; Then put it in a cold water pot to cook, so that the eggshell is not easy to break.