What is Cold Brew? Cold brew takes a different, more patient approach. Instead of a quick blast with hot water, the cold brew process steeps coarsely ground coffee in cold or room temperature water for an extended period of time, usually somewhere between 12 and 24 hours. At Joan + Joe we have found the perfect formula for our cold brew that we are proud to share with friends. Read more about the chemistry and process behind the smoothest cup of coffee you've ever had.