How to Make Cold-Brew Coffee - foolproof method for incredible iced coffee. To check if your coffee beans are fresh, scoop 1/2 cup into a zipper-lock bag and press out all the air, then seal the bag and leave it overnight. If the beans are within seven to 10 days of roasting, they will make the bag puff up from the carbon dioxide that they release. If the bag remains flat, then the beans are not producing gas—a sign they've passed the point of peak freshness.
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