How to make old yeast from fermented grains?

1, required materials: 500ml of rice wine, 2kg of corn flour and appropriate amount of warm water.

2. Add half a bottle of rice wine to three-quarters of corn flour, stir well, wrap it with plastic wrap and ferment for one night. Corn flour is usually used as starter instead of white flour, because the starter made of white flour is not easy to melt.

3. After fermentation, add the remaining corn flour into the fermented batter several times, and add an appropriate amount of warm water, stirring while adding, stirring until the batter is dry, and it looks like there are many bumps.

4. Knead the batter into small balls and put them on the chopping board or other utensils. Sprinkle proper amount of flour on the chopping board to avoid adhesion.

5. Put the chopping board in the sun for 2-3 days. If there is heating indoors in winter, it can also be put indoors or dried in the oven. After yeast is dried, it can be sealed and stored in plastic bags.