A type of sourdough bread popular in Germany, made with bread flour or whole-wheat flour and rye flour, which is one of the most widely cultivated and used grains in the country.
A type of sourdough bread that originated in France. The sourdough leavening method actually originated in France and from there, its popularity spread to many parts of Europe and then to the new world and became very popular with the pioneers during the 1849 Gold Rush in California.
A leavening agent for sourdough bread that enables the bread dough to rise. The primary difference between making bread with a sourdough starter and making bread with the direct or straight yeast method (the method familiar to most home cooks) is that starter breads require much more time to prepare, but the flavor and texture of the bread is almost impossible to achieve with other leavening methods.