You can make homemade yeast from the peel and core of an apple. Leave the fermentation up to the sunshine!
At first, I used a whole apple to make yeast, but it seemed like a waste, so instead, I used the peel and core after eating the apple.
・Be sure to stir once a day, and open the lid to refresh the air. ※ Rotate the upright jar in circles with the lid on. ・You will start to hear fizzing then it starts to ferment.
Enjoy Japanese food around the world.