1. Prepare 50g yeast, 100g flour and 50ml warm water, mix flour and yeast, add warm water and stir well.
2. Leave the mixed batter at room temperature for 2-3 days, let it ferment naturally, take it out every day, add the same amount of flour and water, and continue the fermentation.
After a few days or weeks, when the batter becomes thick and dense with bubbles, you can get raw noodles.