1. Add yeast to warm water. Use warm water to ferment faster, as long as it is not hot to the touch.

2. Add flour, sugar, oil and salt.

3. Knead it into a smooth dough and knead it as you would for washing clothes. The more delicate the dough, the better. Cover it with plastic wrap.

4. Add hot water to the steamer and ferment the dough until it doubles in size.

5. If the dough does not bounce back when you insert your fingers into it, sprinkle some flour on the table, take out the dough, knead until there is no flour, cut it into the shape you like, arrange it, cover it and let it rise for 20 minutes.

6. Steam in cold water for 15 minutes, then turn off the heat and simmer for 5 minutes.