Can Cold Brew Coffee be Heated?

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William Ukers, in his exhaustive All About Coffee (1922) describes a British practice of brewing at room temperature overnight, and then very gently heating the strained coffee in the morning. When I first heard about cold brew about 20 years ago, I was advised to make a concentrate and then dilute it with hot water. Either way, it can be done–but whether you will enjoy the taste only you can answer!