To make your own yeast powder, first heat and sterilize the bottle to hold the yeast, scald the raisins with hot water to prevent spoilage, and then put the raisins and water into a glass bottle for fermentation. When white foam appears in the glass bottle and the taste changes to wine, you can add flour and stir to make yeast powder. Preparation tools

Prepare ingredients and tools: 80g raisins, 240g water, flour, kitchen paper, sieve, glass bottle. Step 1

Boil the bottle intended to hold the yeast in boiling water for 10 minutes to sterilize it. Turn the boiled bottle upside down to drain the water. Step 2

Place 80g of raisins in a sieve, and scald the surface with hot water to sterilize it. This can prevent the raisins from spoiling when making yeast and remove the scalded raisins. Spread the dried raisins on kitchen paper and wait for them to dry slowly. Step 3

Pour the raisins and cold boiled water into a glass vessel and place it in a warm place to slowly ferment until you can smell the wine and you can still see the bottle When white foam appears inside, it means fermentation is complete. Step 4

Pour a small amount of flour into the glass bottle and stir. After fermentation for a period of time, the volume will increase and the yeast will turn into lumps. Break the lumpy yeast into pieces. It can then be used as yeast powder.