Wash the sweet potatoes thoroughly and peel them.
Cut the sweet potatoes into small pieces and steam them.
Mash the steamed sweet potatoes until smooth.
Add glutinous rice flour and salt, and knead into a dough.
Divide the dough into bite-sized pieces and roll into balls.
Place the dough balls in a steamer and steam them.
After cooling, coat with soybean powder or brush with sesame oil to finish.