1. Add flour, old yeast, baking soda, water and dough in the basin, and stir for a while.
2. Roll the dough into long strips, pick it up to about 25g of a small flour agent, roll it into a round skin, pack in some bean paste filling, tightly seal the mouth, press it flat, and it will be a cake.
3. Brush a small amount of water on the cake and stick on the sesame seeds. Bake in the oven. When the cake is cooked, it will crack and show the bean paste filling.