1. The taro balls fall apart as soon as they are rubbed because there is no heating water when mixing with the tapioca flour. That is, the tapioca flour needs to be scalded partially with boiling water. Then mix the tapioca flour into the taro so that it sticks together.

2. If the taro balls fall apart easily when kneaded, it may be because too much tapioca flour and too little water are added, which will cause the taro balls to fall apart as soon as they are kneaded, making it difficult to roll them into strips.