Boil the eggs in cold water 10 minute. If you boil eggs in a pot with cold water, you must wait for the water to boil slowly. In this process, the temperature is relatively low, and the egg protein solidifies relatively slowly. Generally, water is boiled for 5 minutes, and then boiled for 3 minutes to completely cook the inside of the egg. This will make the yolk slightly dry, but it can ensure that the eggs are gradually heated and cooked evenly. Eggs should be picked up as soon as possible after they are cooked, and should not be cooked in the pot for a long time.

After washing the eggs, soak them in a pot filled with water for one minute and boil them with low heat. After boiling, simmer for 8 minutes. Don't cook for too long, otherwise ferrous ions in egg yolk will react with sulfur ions to form brown precipitate of ferrous sulfide, which will hinder the absorption of iron by human body.