Old yeast is used when making steamed bread. How to make your own old yeast?

Cultivating old yeast can write a book in theory, but it is very simple in practice. The source of old yeast at home is a small piece of flour left over from the last time flour was used to make steamed bread or steamed buns. As long as it is properly preserved, there will always be flour and fertilizer at home. Buy 1 Qian Yuan old stove, put it in a small pot, add appropriate amount of warm water, stir well, add appropriate amount of flour, stir into batter, cover it and let it ferment. Fermentation time will change with the change of temperature. A month later, when you need to make dough, take a dough. At this time, the dough will dry and harden. Break it into small pieces with the back of a knife, put it in a clean basin, soak it in more warm water, and then add corn flour. If you add it twice a day, you will see many small bubbles. In summer, you can dry the corn flour in two or three days.

Old yeast is also called noodles, noodles, noodles, noodles, etc. It is called binding surface here, that is, introducing binding surface. I believe many people can make steamed buns because it is convenient and easy to operate. Only the older generation likes to steam steamed bread with fermented noodles. Steamed buns taste more fragrant and chewy. Old yeast is a must at home. Every time you finish making steamed buns, you should leave a little yeast, put it in a small covered vessel, and then put it in the refrigerator for ten days and a half. No problem. When you want to use it, take it out and heat it, stir it evenly, put it in a warm place for fermentation, and circulate it in turn. ...

Why use corn flour instead of flour? This is mainly to provide enough nutrition for the strain and make it full of value, so that the fermented dough will have enough fermentation power in the future. It is much more nutritious than wheat flour in providing nutrition for strains. At the same time, in the long-term low temperature environment, the growth of yeast will become very slow, even yeast will not grow, and finally the noodles you use will be moldy and discarded directly. The production method of old yeast: 200 grams of corn flour, 40 grams of liquor and 90 grams of water. Knead into a ball, cover with plastic wrap, let stand and ferment, and air dry naturally after making. It turned into an old yeast.