Altbier

A Düsseldorf style and a modern extract batch

Altbier is a top-fermented German beer associated with Düsseldorf. The German Brewers Association locates its origin there and describes the style as hop-bitter, fresh and fruity, with caramel and light roast notes. Those broad style notes do not define a single recipe. The AHA homebrew batch below is a modern US extract adaptation, attributed to the July/August 2009 issue of Zymurgy; it is not a historical Düsseldorf household formula or the commercial process of a particular local brewery.

The AHA describes “Alt” as an older ale-yeast tradition in contrast with later bottom-fermenting beer, with fermentation at the cooler end of the ale range. The German association likewise classifies Altbier as top-fermented. This shared category helps distinguish Altbier from Kölsch and lager, but does not make their ingredients, yeast strains or production schedules interchangeable.

The source batch and its ingredients

The AHA recipe yields 5.5 US gal (21 L). Its grain-derived ingredients are two cans of light malt extract, light liquid Munich malt extract, Special B, CaraMunich and Carafa malts. Perle hops supply the 45-minute bittering addition and Tettnang the final 15-minute addition; Irish moss is listed for that final portion as well. The source offers three German ale yeast choices or a sufficient starter. These are alternatives in one modern recipe, not evidence that Düsseldorf breweries use the same yeast.

The page lists OG 1.053, FG 1.012, 5.4% ABV and 42 IBU. These are recipe specifications, not measurements of every Altbier and not a statement about protected geographic identity. The stated fermentables and timings should stay tied to this five-and-a-half-gallon extract batch; this record has no tested scaling rule.

Stages in the AHA method

The directions begin with specialty grains in 2 US gal (7.6 L) of cool water, heated to 170°F (77°C), then strained. The extracts are stirred into the liquor, the kettle is brought to 3 US gal (11.4 L), and the wort boils for 60 minutes. Perle goes in with 45 minutes remaining, followed by Tettnang and rehydrated Irish moss for the final 15 minutes. The source then calls for cooling, topping the fermenter to 5.5 US gal with cold water, aerating and pitching at 65°F (18°C).

The AHA schedule is one week of fermentation at 65–68°F (18–20°C), or until complete, followed by one week of secondary aging at 65°F (18°C). The page does not give a stable-gravity measurement procedure or require a period of stable readings. It lists 1.5–2.5 volumes CO₂ but does not supply a complete packaging procedure. Those omissions remain visible here.

Limits and safety gaps

The recipe is useful as a source-specific modern homebrew example, but its directions do not establish that fermentation has ended or that a package is safe to carbonate. The Brewers Association identifies unintended refermentation in packages as a rupture and food-safety hazard. This record therefore does not turn the AHA one-week schedule or listed carbonation range into a pressure limit or safety test.

The named commercial Schumacher process and the AHA homebrew recipe are separate evidence. Brewery equipment, fermentation and cold-storage timings cannot be substituted for missing household controls in this extract method. A current, source-backed package procedure and completion test remain open.

A separate commercial brewery account

Brauerei Schumacher publishes a process account for its own commercial Alt. It describes a roughly two-hour mash through temperature rests, lautering, sparging and a boil with aroma hops. The brewery says its wort enters the cellar at 20 °C and ferments with its own top-fermenting Saccharomyces cerevisiae yeast for three days. It then describes about four weeks in closed tanks at around 3 °C, followed by filtration. These values and steps belong to Schumacher's brewery process; they do not fill gaps in the AHA extract batch or define how Altbier is made across Düsseldorf.