500g of flour:10g of dry yeast or 3g of yeast plus15g of white sugar (if instant yeast is used, the dosage can be appropriately reduced).

Specific operation steps:

1. Mix dry yeast or yeast with white sugar, add it into flour and stir well.

2. Gradually add warm water, knead it into smooth dough, and cover it with a wet cloth 15 minutes.

3. Knead the dough into strips, cut it into small pieces of equal size, put it on the chopping board, flatten it with the palm of your hand, and cover it with a wet cloth 15 minutes.

4. Knead the dough into a round shape, put it into a preheated boiling water pot, boil it with high fire, and then steam it on low heat 10 minute.

5. Turn off the fire, don't open the steamer cover immediately, let the steamed bread stand in the steamer for 3-5 minutes before taking it out.