2. Peel the yam and cut it into small pieces.
3, ribs drowning to blood bubbles, add ginger and garlic when drowning.
4. Put enough water into the saucepan, put all the ingredients into the saucepan, boil over high fire and skim off the floating foam.
5. Cook over low heat for more than 2 hours until the soup is pure white. Boil the soup with high fire 20 minutes before taking out the pot, and the soup will become more pure white.
6, according to personal taste, add salt to taste. Efficacy: nourishing yin and tonifying kidney, strengthening tendons and bones.