Steam the prepared yam and sweet potatoes for 30 minutes until it's fully softened.
Once softened, sift them separately through a drum sieve.
Separate them into 2 separate bowls. For taro balls, mix all the ingredients in mixture c together and knead them until a smooth consistency is achieved.
For sweet potato balls mix all the ingredients in the mixture d together and knead until smooth.
Prepare a pot of boiling water and 2 bowls of filtered room temp water.
Roll the 2 flavors separately into long, 1.5 cm thick logs.
Using a scrapper, cut the log-shaped dough into ½ inches pieces.
Drop the dough separately into the boiling water and boil it until it floats.
Once float, remove it from the boiling water with a spider and dip it straight in the prepared room temperature water to cool it.