What does the term "ungespundet" refer to in brewing?

The term "ungespundet" specifically refers to a traditional brewing method associated with certain types of Keller beer. Keller beer is an unfiltered, often unpasteurized lager that is typically served directly from the conditioning tank, and "ungespundet" denotes that the beer has not been carbonated under pressure or filtered, allowing it to retain a certain freshness and flavor profile. This style highlights the natural characteristics of the beer and yeast, providing a more rustic and authentic experience for the drinker.

The other options, while related to brewing, do not accurately describe the meaning of "ungespundet." For instance, carbonation methods and types of yeast are distinct concepts in brewing terminology, and there is no recognized brand of beer known specifically as "ungespundet." The choice of Keller beer captures the unique quality and context of this traditional brewing approach.