Antilles Old Fashioned

Directions

1. In the bottom of a double old fashioned glass douse the sugar cube with Curaçao. Give it a good whack to break it apart.
2. Muddle the grapefruit peel–peel side down–into the sugar. Do this for a minute or two to release the oils. The sugar should be syrupy by the time you're finished.
3. Add the whiskey and a large ice cube and stir using a cocktail stirrer: 30 spins in one direction then 30 spins in the opposite direction.
4. Serve in glass.