Steam the sweet potatoes and mash them. Add 3 tbsp flour and 0.3 tsp salt to make a dough. Adjust the flour amount based on the moisture of the sweet potatoes.

Shape the dough into small round pieces. Optionally, add chopped cheese or nuts inside the dough. Heat oil in a pan and fry the sweet potato pieces until golden brown.

In a pan, mix 2 tbsp soy sauce, 1 tbsp corn syrup, 1 tbsp sugar, 1 tbsp rice wine, and 0.2 tsp cinnamon powder. Bring to a boil and add the fried sweet potato pieces. Simmer until coated evenly.