Rib Soup Again! (with Lotus Root and Black Kidney Beans)

My husband is a crazy soup lover. Chicken soup and Rib soup are two kinds which I always cook for him. This time, I tried to make soup with black kidney beans. 1. Soak kidney beans in advance. 2-3 hrs maybe. 2. Wash ribs under water over and over again. 3. Place ribs in a…