Sourdough breads are made using a sourdough starter. The starter cultivates yeast and lactobacilli in a mixture of flour and water, using the microorganisms by now existing on flour; it doesn't want any included yeast. In the sponge-dough method, only a few of the ingredients are combined, forming a sponge https://fooded48147.blogaritma.com/30488937/food-learning-center-things-to-know-before-you-buy