Reader Jo writes:
Hey Joe! Is diacetyl one of the “natural butter flavors” that I so often see on butter packages?
Indeed it is, Jo. Many American mass-market butters, especially unsalted butters, contain “natural flavors.” The most common are diacetyl, acetic acid, acetoin, ethyl formate, ethyl acetate, 2-butanone and others. In other words, the typical brew of compounds that fermenting bacteria create as they digest sugars.
It all sounds like stuff that runs off a parking lot in a rain storm, but in fact these naturally-occurring chemicals are what give fermented foods – from beer to bread to yogurt and pickles – their flavor. Depending on the proportion in which they’re delivered, they can taste tangy, flowery, bitter, gamey or…buttery.
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