2. You can taste a small piece of green beans. If there is still a bean smell, it means that it is not cooked; On the contrary, it is ripe.
3. Look with your eyes and see that the skin of green beans changes from cyan to light blue yellow, which means it is ripe.
4. When burning green beans, you can blanch them with hot water for 6-7 minutes first, and it is easier to cook them after blanching.