London cafe Bean & Wheat makes a charcoal latte made from grounded coconut shells. The caffeine-free drink, called Black Heart Latte, is made with only charcoal, milk, and vanilla. "The reason why ...

Store the charcoal off the ground if possible to allow air circulation. Oh, and just in case it needs to be said, keep your charcoal away from any heat source, since it's, you know, flammable.