Boiled Egg Trilogy Various Boiled Eggs (20 photos) Boiling eggs seems simple, but it is very knowledgeable. If cooked improperly, the nutritional content of eggs will be destroyed. Wash the fresh eggs, soak them in a pot of water for one minute, then bring to a boil over low heat. This is to prevent the eggshells from bursting during cooking. After the eggs are brought to a boil over low heat, switch to warm heat and cook for 8 minutes. Do not cook for too long, otherwise, the ferrous ions in the egg yolk will react chemically with sulfur ions to form a brown precipitate of ferrous sulfide, which will hinder the body's absorption of iron. Boiled eggs should be taken out and allowed to cool naturally, or placed in boiling or cold water for half a minute to make them easier to peel. To prevent bacterial infection, it should not be placed in tap water. Edit this section to make tips: Do you think boiling eggs is particularly easy? Boiling water eggs for a while is OK. Is this really the case? In fact, there are some tips for boiling eggs. 1. Soak in water. Before boiling eggs, it is best to soak them in cold water for a while. The water must cover the eggs, otherwise the protein will not coagulate easily and affect digestion. Then soak the eggs in cold water for a while to reduce the content of the eggs. air pressure; then put it into a pot of cold water and boil it so that the eggshell is less likely to break. Of course, this is just one way to keep the egg's shape intact. 2. Firepower. If you use high heat when boiling eggs, it will easily cause the air in the eggshell to expand rapidly and cause the eggshell to burst; if you use low heat, it will prolong the time of boiling the eggs, and it will be difficult to control the tenderness of the eggs. Practice has proven that medium heat is the most suitable for boiling eggs. 3. Time. After determining the size of the firepower, as long as you accurately grasp the boiling time, you can control the tenderness of the eggs as you like. For example, to boil soft eggs, boil them for 3 minutes after the water boils. At this time, the egg white is solidified and the egg yolk is still fluid; boil the soft-boiled eggs for 5 minutes after the water boils. At this time, the egg white is solidified and the egg yolk is thick liquid, soft, tender and smooth; boil hard eggs and boil the water for 7 minutes. At this point the egg white is solidified and the yolk is dry. It should be noted that when boiling hard eggs, the time must not be extended arbitrarily. Because when eggs are cooked in boiling water for too long, more than 10 minutes, a series of chemical changes will occur inside the eggs, thereby reducing the nutritional value of the eggs. 4. Stir. In order to make the egg yolk solidify in the middle of the egg white, after the eggs are placed in the pot, stir them continuously in one direction with a spoon to make the water in the pot rotate in a vortex until they are cooked. As for the principle of this, it must be related to the centrifugal force and centripetal force in physics.