Measure the volume of your ice trays. Make that amount of coffee extra strong (I like espresso). You may wish to consider decaffeinated coffee since these are often served as dessert itself or an after dinner drink. Let the coffee cool to room temperature and pour into the trays. Freeze.

Pop out and into freezer bags. Serve 3 cubes in a highball glass with a finger or two of Irish Cream. It's decadent and easy.