Preparation materials: high gluten flour, water, glass container, spoon, warm water.

1, first of all, prepare a clean and waterless glass container, and then pour 10 grams of gluten flour, 20 grams of water and mix well.

2. After mixing well, cover with a lid and keep it sealed, and let it stand for 24 hours.

3, 24 hours later, open the lid, again pour 10 grams of gluten flour, 20 grams of water.

4, mix well again, and then re-seal and store for 24 hours.

5. Repeat for 6 days, open the lid every day, pour in 10g of gluten flour and 20g of water, then cover and leave for 24 hours.

6. On the sixth day, take out the yeast mixture, then pour 15 grams of it into 150 grams of high-gluten flour.

7. Pour another 150 grams of warm water.

8. Stir well.

9: Stir well, cover with plastic wrap, then let stand for 24 hours.

10, finished.