1. Put 200 grams of mashed sweet potatoes, 100 grams of oats, 100 grams of white sugar, and 6 grams of yeast in a large bowl.
2. Continue to put 500 grams of flour and 200 grams of milk.
3. Knead into a smooth dough (knead more than 100)
4. Fermentation is twice the size.
5. Add a small amount of dry flour to the fermented dough to knead the dough smoothly.
6. Take an appropriate amount of small dough and round it.
7. Cut the cross with a knife.
8. Fermentation is twice the size.
9. Steam on high heat for 18 minutes and simmer for 5 minutes.
