They may also include vegetables, chicken livers, or ginkgo nuts. They are first marinated in teriyaki sauce, a sweetened version of soy sauce with the addition of sake, honey, and ginger. Yeast - A fungus used in the production of bread and beer. Yeast, in the environment of sugar, produces carbon dioxide and alcohol. This process is called fermentation.
Bread yeast comes in dry granulated and fresh cakes.
A new form of yeast, called instant yeast, has been developed which allows the user to mix the yeast directly into the flour without dissolving it first in water.