When you cook the beans, it is best to put cold water in the pot, and to put enough water at one time, not in the process of cooking to see less water and then randomly add water, otherwise it will make the cooked beans taste bad.
When you want to cook the beans, you can open the lid after the pot is open, and then a few drops of cooking oil, so that the water stays boiling, continue to cook for ten minutes after turning off the fire, take out the beans, so that the color of the beans is especially good.