Funny you should mention that, because I was recently reading that many fruit - in particular the banana - get their distinctive smell/taste not from the fruit itself, but from the yeast decomposing the fruit. Someone took beer yeast, made them more like banana yeast, and the end result was, just from the alteration of the yeast, a beer that was described as being like an intensely flavored banana milkshake. (It was not considered a success, oddly.)
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