1, soak. Before boiling eggs, it is best to soak the eggs in cold water for a while, and then put into a cold pot of boiling water, so that the eggshell is not easy to crack. Of course, this is only one of the ways to keep the shape of the egg intact.

2, fire. Boiled eggs, if you use a big fire, easy to cause rapid expansion of air in the eggshell and lead to eggshell cracking; if you use a small fire, and prolonged the time to cook the eggs, and it is not easy to grasp the degree of good eggs old and tender. Practice has proved that boiled eggs to medium fire is most suitable.

3, time. After determining the size of the fire, as long as accurately grasp the time to cook eggs, you can control the degree of tenderness of the egg at will. For example, soft boiled eggs, boiling water can be cooked for 3 minutes. At this time, the egg white solidified, the yolk is still fluid; cook loose eggs, boil the water and cook for 5 minutes. At this time, the egg white solidified, the yolk was thick liquid, soft and smooth; hard-boiled eggs, boil the water and cook for 7 minutes. At this time, the egg white solidified, the yolk is dry. It should be noted that hard-boiled eggs do not extend the time at will. Because the eggs in boiling water cooking time is too long, more than 10 minutes, the eggs will occur within a series of chemical changes, thus reducing the nutritional value of eggs.

4, stirring. In order to make the yolk solidified in the middle of the egg white, should be in the egg in the pot with a hand spoon constantly stirring in one direction, so that the water in the pot was swirling and turning, until cooked. As for what principle this is, I think it must have something to do with centrifugal force and centripetal force in physics.

How do I cook an egg so it peels easily?

It is not a good idea to cool hard-boiled eggs in cold water. Because there is a gas chamber in the egg with a diameter of 4 to 11 millimeters, when you boil an egg, as the temperature rises, the air pressure inside the gas chamber also rises, and the gas inside the gas chamber will be pushed out of the egg. When the hard-boiled eggs into the cold water, the temperature drops sharply, the pressure inside the gas chamber decreases, will make the eggshell outside the cold water and microorganisms, through the air holes into the eggs, hard-boiled eggs and contaminated.

The hard-boiled egg is taken out, you should use a clean rag to wipe the surface of the eggshell water, so that it is naturally cooled, so that it is good to peel, and hygiene.