It is not the ribs that are black, it is probably your lotus root that has touched the iron container that will make the soup black. Want to simmer a fresh and fragrant thick white ribs and lotus root soup can be like this. Cut the positive ribs into chunks. Blanch them in boiling water first. Remove the blood in the ribs. Then fish out and control dry. Then stir fry the ribs with oil, pour the ribs into the pot and stir fry until you can smell the fragrance. Then put them into a tile pot and add the right amount of water. Note that the water should not use cold water, nor boiling water. Warm water is enough. Put in the ginger slices. First boil the soup on high heat. Then simmer it over moderate heat for about 2 hours. Until the ribs are almost crispy, put in the lotus root. Lotus root is good if it is raw, don't put it in the iron pot to fry, or the soup will be black. When the lotus root powder after turning off the fire can be. Guaranteed good drink oh ~