Colorful sweet potato and taro balls in warm sweet soup are a chewy, comforting dessert. A family recipe with naturally sweet, fresh ingredients.
Peel sweet potatoes and taro, then cut both into equal 1-inch cubes for even cooking.
Steam sweet potato and taro cubes separately over medium-high heat for 20 minutes until fully soft but not mushy.
Mash steamed sweet potatoes and taro while warm, adding a pinch of salt to each, then gradually blend in tapioca starch (about 0.6 cup per root) until a smooth, non-sticky dough forms.
Roll each dough into ½-inch thick ropes and cut into bite-sized balls. Dust with extra tapioca starch to prevent sticking.
Bring 5 cups of water and the sugar to a gentle boil, stirring until the sugar is dissolved. Reduce to medium heat and drop taro and sweet potato balls in; stir gently to prevent sticking.
When the balls float to the surface (about 3–4 minutes), let simmer for 1–2 more minutes for a chewy texture, then serve hot with sweet soup.