Eggs boiled in cold water for 10 minutes is appropriate. Cold water to cook eggs, we should wait for the water to boil slowly, this process of temperature is relatively low, the egg protein is relatively slow solidification, the general water boiling time to 5 minutes, and then continue to cook for 3 minutes, the egg internal completely cooked, this egg yolk will be slightly dry, but can ensure that the egg gradually heat, evenly cooked. Eggs need to be picked up as soon as possible after cooking, and should not be left to cook for a long time.

Wash the eggs, put them in a pot of water to soak for a minute, and boil them over low heat. After boiling, cook for 8 minutes over moderate heat. Do not boil for too long, otherwise, the ferrous ions in the yolk will have a chemical reaction with sulfur ions to form a brown precipitate of ferrous sulfide, preventing the body from absorbing iron.