A base of Pils malt with judicious amounts of dark cara malts and a tiny bit of black or roast malt. Often includes maize. Low alpha acid continental hops are typical (avoid high alpha or distinctive American hops). Saccharomyces and Lactobacillus (and acetobacter) contribute to the fermentation and eventual flavor. Lactobacillus reacts poorly to elevated levels of alcohol. A sour mash or acidulated malt may also be used to develop the sour character without introducing Lactobacillus. Water high in carbonates is typical of its home region and will buffer the acidity of darker malts and the lactic sourness. Magnesium in the water accentuates the sourness.