Cicerone Certified Beer Server Practice Test

What flavor is commonly associated with the presence of diacetyl in beer?

1. Earthy flavor

2. Buttery flavor

3. Fruity flavor

4. Spicy flavor

The correct answer is: Buttery flavor

Diacetyl is a compound that is naturally produced during the fermentation process, particularly by yeasts. It is known for imparting a distinctive buttery flavor to beer. This buttery note can resemble the taste of butterscotch or buttered popcorn, which often stands out prominently in beer styles that may not have sufficiently cleaned up diacetyl during fermentation. While some other flavors like earthy, fruity, or spicy can be associated with various other compounds and ingredients in beer, the most recognized and defining characteristic of diacetyl is its buttery flavor. Understanding this aspect is crucial for brewers and beer servers, as it helps in identifying and managing fermentation issues that could affect the beer's overall quality and flavor profile.