Place 1/4 cup whipping cream in a medium bowl. Beat with a mixer at high speed until stiff peaks form.
Heat 6 mugs by running under very hot water; dry with paper towels.
Pour about 4 teaspoons whiskey into each glass. Add 2 teaspoons sugar to each serving; add 2/3 cup coffee, stirring until sugar dissolves. Top each serving with about 1 1/2 tablespoons whipped cream (do not stir).
Traditionally, a strong Irish whiskey is used, such as Tullamore Dew. I prefer Jameson. A spoonful or so of raw sugar is also added to the brew. I add a shot of Kahlua instead. It makes a great desert all by itself.
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