This bitter soup is bursting with earthy flavors from the leeks. Its hardiness comes from the potatoes and tapioca pairs, small pasta like balls found in Asian cultures. Vegetable broth is less salty than chicken broth and makes this a completely vegan dish! There are many cooking steps, so plan ahead of time if you are going to make this soup. It’s one to make a day or two in advance and store in the refrigerator to be heated up later.