2. First, prepare proper amount of flour, active dry yeast, edible salt and vegetable oil. Choose a bowl of suitable size, spread vegetable oil on the bowl surface, add warm water, add dry yeast and edible salt, and stir well. Finally, pour in the batter made of flour and vegetable oil and stir well.
3. Add appropriate amount of water to the steamer and heat it to about 40 degrees. Put the bowl in water to keep the batter warm, cover it and bake for about half an hour, until the dough is 2-3 times its original volume and steamed over high fire.