2. Rinse the beans several times first, then soak them for 10 minutes, and then rinse them clean.
3. Boil a pot of water, add salt, and then put the beans in the pot and cook for about two or three minutes until the color turns green. Soak it in cold water immediately after taking it out.
4. Then hang it in the sun to dry (if the sun is good, it can be dried in about 2 days). After that, it can be bundled and stored in a dry place. You can take it out to dry every month or two (about 200g).