Why do you make rice cakes with a sour taste

Excessive fermentation. The sour smell of the cake is proof that the fermentation time is too long or caused by adding too much yeast, especially brown sugar cake, which has a certain promotion effect on the yeast fermentation, and it is easy to over-fermentation. The yeast and the dough itself is a kind of acidic substance, eating itself with a certain sour flavor, when the yeast added too much sour flavor will be more obvious.

Steaming out of the cake out of the acid can still eat it: can eat. Just steamed out of the cake with a sour taste, just fermentation caused by the excess, and will not breed harmful substances, is the yeast in the respiration of alcohol and esters produced under the volatile acid phenomenon, you can rest assured that consumption, but if it is long deterioration of the sour taste, can not be consumed, or to the detriment of health.