0b6eac66__Beer_Flaws_with_Doctored_Beer__Flavor
[Taste/Aroma] Buttery/butter scotch [Adulterant] Butter extract [Amount Added] 18 to 20 drops of extract in 24 oz of base beer [How Created] Yeast byproduct during fermentation, the amount of which is determined by yeast strain. Can be a sign of incomplete or sluggish fermentation. [Flavor] 
Diacetyl
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Tasting Beer Flaws with Doctored Beer
Flavor