For this recipe, use the liqueur left over after making the trifles.
Combine coffee and cinnamon sticks; cover and steep 15 minutes. Discard cinnamon sticks. Stir in milk and liqueur; cover and refrigerate 1 hour or until thoroughly chilled. Serve over ice.
Light and refreshing, super easy. Make sure its really cold before pouring over ice though. When the ice startes to melt the drink isn't any good. Bet it would taste good frozen!