1. Knead the flour, water, and yeast into a dough, divide the dough into half and knead the purple sweet potato flour
2. Two doughs are separated
3. Fermented to double size
4. After venting, roll out, the purple dough is stacked on the white dough
5. After rolling up, rub it a little longer
6. Cut into 16 portions
7. Put it in the steamer and ferment for half an hour for the second time
8. After the water boils, steam for 15 minutes
Tips:After steaming, simmer for five minutes before opening the lid.
