Rinse the red beans thoroughly. Add them to a pot with water and cook using a rice cooker. Add 2 cups of water to the outer pot; when it switches off, add another 2 cups of water and cook again until the beans are tender.

Once the red beans are soft, add sugar to taste.

Bring a pot of water to a boil. Add the sweet potato balls and taro balls, and cook until they float and are cooked through. Remove them and add to the red bean soup.