Green beans should be boiled in water, simmered for 5 minutes or simmered for 10 minutes. At this time, the green beans will become soft or discolored after boiling water, which is ripe.

When eating green beans, they must be cooked, and they can only be cooked thoroughly. The appearance of green beans has lost its original turquoise color, and there is no smell of beans, which means that green beans have been completely cooked, otherwise it will cause food poisoning. At the same time, we should pay attention not to buy or eat old green beans, and remove both ends of green beans and bean tendons, which contain more toxins.