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Diacetyl in beer is perceived as

  • A.A bitter flavour contributed entirely by the hops
  • B.A smoky flavour arising during the kilning of the malt
  • C.A butterscotch flavour, usually regarded as a fault
  • D.A sharply acidic flavour, always regarded as desirable

Answer: C

Diacetyl gives a butterscotch or toffee note that is a fault in most styles. Yeast produces its precursor during fermentation and then reabsorbs and reduces it during conditioning, which is why a beer taken off the yeast too early can taste of it.

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