Lievito

There are two types of yeast, one natural and one synthetic. They both have the task, through their fermentation, of producing bubbles in the combination of flour and water, or other ingredients, in order to raise and aerate the mixture and thus obtain a softness in the baked goods. Bread without yeast would be flat and hard and inedible. The best yeast is a by-product of making beer. The pinky brown substance is diluted with water and mixed with whatever is to be baked. It is important to allow the fermentation to take place in a warm place, before putting the dough in a hot oven. Synthetic yeast does not need such pre-fermentation.