1. 200 grams of steamed mashed sweet potatoes, 300 grams of flour, 4 grams of yeast, and 15 grams of white sugar.
2. Add appropriate amount of water and knead into a smooth dough (more than 100 times)
3. Roll out a rectangular dough sheet.
4. Brush the oil.
5. Roll up.
6. Cut into small pieces evenly.
7. Take one piece, turn it over, close the two ends, pinch it tightly, and use it as the bottom.
8. Put it in a greased steamer.
9. Put the steamer into the steamer at about 50 degrees and let it stand for 1 hour. (winter)
10. Steam on high heat for 15 minutes, stuffing for 5 minutes. The inner structure is layered layer by layer, like a flower roll.
