1. Use hot water to soak it for a day or more. You may add a tiny bit of baking soda in the water;
2. Pour in enough water when you boil the beans, never add cold water in the middle of boiling;
3. Some beans are just too old to be cooked
2. Pour in enough water when you boil the beans, never add cold water in the middle of boiling;
3. Some beans are just too old to be cooked