1. Dissolve sugar in black coffee in an Irish coffee glass or a heat-resistant, non-metallic glass, cup or mug. (DO NOT USE A GLASS WITH METALLIC TRIM.) 2. Heat, uncovered, in Microwave Oven 1 to 2 minutes or until hot. 3. Stir in Irish Whiskey. 4. Carefully float a spoonful of whipped cream on top.