Schumacher Alt Beer mat, Düsseldorf, Germany.

- Image ID: CEX86H
Schumacher Alt Beer mat, Düsseldorf, Germany.
David Davies / Alamy Stock Photo
Image ID: CEX86H
Altbier is a German top-fermenting beer brewed in Düsseldorf and other parts of North Rhine-Westphalia. The name Altbier, which means old beer, refers to the pre-lager brewing method of using a warm top-fermenting yeast. Over time the Alt yeast adjusted to lower temperatures, and the Alt brewers would store or lager the beer after fermentation, leading to a cleaner, crisper beer than is the norm for some other top-fermented beers such as British pale ale.