It should be under cold water. If you want green bean soup is good, it is best to cold water under the pot, with cold water to let the green beans slowly heat, and then turn to high heat to boil, and then slowly simmer over medium-low heat, so that the cooked green beans can be more crunchy in texture, and the nutrients will not be destroyed

If it is hot water under the pot. With hot water to cook green beans, green beans directly in contact with hot water, the shell will soon be cooked, green beans in the nutrients will be easily destroyed, which vitamins and so on will be lost. Also because of uneven heat, resulting in entrapment is not easy to cook rotten, the taste of green bean soup will not be good, so it is not recommended to use hot water Oh

Warm tips:

1. Cooking green beans can not be simmered in an iron pot, because of the flavonoids in the mung beans will react with the iron pot, affecting the mung bean itself antioxidant, thus reducing its effectiveness, eat in the mouth will have a kind of iron taste

2. It is best to use pure water to cook, green bean soup color will not be red.