Read about on life hacks and finally tried it, basically you take your left over coffee and pour it into an ice cube tray. Once frozen, you throw a few cubes in with the some milk or water and get a nice cold coffee drink. I mixed mine with some TJs rice milk that was not too shabby. Got me thinking though....would be great with kahlua, or perhaps in some type of martini. Maybe some kahlua and some rum in the blender to make coffee margaritas?