When Does Coffee Go Rancid? - CHOW Tip

Maria Cleaveland of Equator Estate Coffees&Teas suggests that you grind only as much coffee as youre going to brew, and that you brew it immediately. Ground coffee goes rancid easily. No one wants that.

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TRANSCRIPT
Although it may be convenient for you, grinding your coffee way ahead of time can lead to oxidation and perhaps rancidity. You know it's gone rancid on you if it tastes like rubber or cigarette ashes. Since you know you don't want that, just go ahead and grind your coffee right before you brew it. You're maintaining the subtle aromatics in the beans and extracting lots and lots of flavor.