Brottrunk (literally meaning "bread drink" in German) is a fermented grain beverage similar to bread kvass, made in Germany from bread. The bread is baked from biodynamically grown grains. This bread is then fermented in a proprietary month-long process. Then, without further processing, the liquid is bottled. First marketed in 1981 by master baker Wilhelm Kanne, this non-alcoholic probiotic beverage is distributed as Kanne Brottrunk in Germany and in several European countries.