1. Clean the surface soil of purple sweet potato, put it in a pot and cook it
2. Peel off the skin while it is hot, and press it into a puree with a spoon
3. Add the right amount of condensed milk according to the taste of each person, and mix the condensed milk and purple potato mash evenly
4. Take a piece of plastic wrap, put 20 grams of purple potato mash, tighten the plastic wrap, and knead the purple potato mash into a ball
5. Put it in a flat plate with coconut paste, make the purple sweet potato balls evenly coat the coconut paste, and put it in the container
