1. Whisk together all ingredients in a medium saucepan over medium heat, and cook, whisking occasionally, 10 minutes or until steamy.
2. Let cool completely (about 20 minutes). Pour 1 1/2 cups coffee mixture into compartments of 1 ice cube tray, and freeze 4 hours or until firm. Chill remaining coffee mixture until ready to serve. Place coffee ice cubes in a pitcher, and pour remaining coffee mixture over ice cubes. Serve immediately.