Pour hot coffee into a 6 ounce glass. Add two teaspoons of sugar and stir to mix.
Add one ounce of Irish whiskey.
In a medium bowl, add the very cold cream. Using a hand mixer or a whisk, whip the cream until it is starting to get thicker. You don't want it to become fully whipped cream, stop before you get to soft peaks. It should be thick but still pourable.
Pour the cream on top of the coffee. Serve.
Notes
The Buena Vista Restaurant uses sugar cubes. Use two sugar cubes if you have them, otherwise using two teaspoons of granulated sugar is fine.