1. Soak the ribs in clear water for one hour, change the water in the middle, soak the bleeding water, and rinse off the dirt on the surface with clear water.
2. Prepare ginger, onion, garlic, star anise leaf, cooking wine and white vinegar, put cold water in the pot, appropriate amount of ginger slices and onion segments, pour a little cooking wine, add spareribs, stir well, then cook over high fire, continue to cook for two minutes after boiling, take out spareribs, and wash off the surface foam with hot water.
3. Put the ribs in a saucepan, add enough boiling water, add ginger, onion, garlic, star anise leaves and appropriate amount of cooking wine to boil, and then simmer for one hour.
4. After one hour, add a teaspoon of white vinegar, let the calcium dissolve in the soup, and continue to stew for about 20 minutes.
5, remove ginger, onion, garlic, star anise leaves, add salt to taste, sprinkle with chopped green onion and serve.