About 15 minutes. Eggs can be steamed with the shell on, and eggs steamed with the shell on are the same as poached eggs.

Eggs can be eaten in a variety of ways, including boiled, steamed, fried and scrambled. In terms of the absorption of nutrients and digestibility of eggs, boiled, steamed eggs for 100%, tender fried for 98%, scrambled eggs for 97%, eggs for 92.5%, the old fried for 81.1%, eaten raw for 30% to 50%. From this point of view, boiled, steamed eggs should be the best way to eat.

But pay attention to chewing and swallowing, otherwise it will affect the absorption and digestion. However, for children, or steamed egg custard, egg soup is the most suitable, because these two practices can make the protein loose, very easy to be digested and absorbed by children.

Expanded Information:

Eggs main value: According to the analysis, every 100 grams of eggs containing protein 12.58 grams, mainly for the egg white. 58 grams, mainly for the egg albumin and egg globulin, which contains the human body essential 8 kinds of amino acids, and the composition of the human body protein is very similar to the body's protein absorption rate can be as high as 98%.

Every 100 grams of eggs contain 11 to 15 grams of fat, mainly concentrated in the yolk, but also very easy to be digested and absorbed by the human body, the yolk is rich in lecithin, sterols, lutein, and calcium, phosphorus, iron, vitamin A, vitamin D and B vitamins.

Baidu Encyclopedia - Hard Boiled Eggs