So you forgot that jar of coffee beans in the back of the cupboard. All may not be lost. Old, stale coffee beans actually make a very decent cold brew. Make sure the beans are not moldy, of course. If they are simply on the stale side, using the cold brew method will yield a very palatable cup. Also store it in ice cube trays for on-demand iced coffee.
There are various ways to cold brew coffee. Here is the easiest method.
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