How long is the fermentation time for making hair cakes?
Generally speaking, it takes at least 180 minutes, which may be longer in winter and 30-60 minutes in summer to germinate and ferment to twice the size. The dough is honeycomb-shaped with large bubbles on the surface, so it can be fermented properly. If the time is too short, the effect of awakening is not good. If it takes too long, the taste will turn sour.
The reason why the cake won't rise.
In order to soften the cake, the dough needs to generate a certain amount of gas to support the dough and fill its pores. We can use yeast to ferment. If we want to harden the dough, we can add some wheat flour. Because the flour added in cold water is harder, and the flour added in hot water is softer. The water temperature should not exceed 40 degrees, otherwise it will kill the yeast and affect the fermentation. This is one of the reasons why the dough can't rise. When pouring sugar, you must stir it first, because direct contact between sugar and yeast will also affect the activity of yeast, which is also one of the reasons that affect fermentation. Don't stir the batter, otherwise it will defoam and the steamed cake will not be fluffy.
What is the reason why the cake is a little sour?
The sour cake proves that the fermentation time is too long or the yeast is added too much, especially the brown sugar cake, which has a certain promotion effect on yeast fermentation and is easy to ferment. Accidentally, excessive fermentation. Yeast and dough themselves are acidic substances, which are very sour to eat. Adding more yeast will make the sour taste more obvious. Yeast produces a certain amount of alcohol when it breathes without oxygen. If the degree of fermentation is not too serious, it will be accompanied by a certain acidity, so the made hair cake is sour. However, as long as the sour cake doesn't go bad, it can still be eaten in small quantities, but the taste will be a bit unpalatable.