1. Add white kidney beans to a proper amount of hot water bubble 1 hour.

2. Cut the air-dried ribs into small pieces

3. Put the ribs in hot water and rinse them.

4. Wash the white kidney beans after they are soaked, put all the materials in the pressure cooker and rotate until the soup is boiled for 30 minutes.

5. After cooking, pour the ribs into another pot, add yam and cook.

6. The soup is rich in white flavor