- 1 1/2 ounces whiskey
- 3/4 ounce light rum
- 1 teaspoon lemon juice
- 1 1/2 tablespoons lime juice
- 1 teaspoon superfine sugar
- 3 or 4 ice cubes
- Club soda
- Combine all ingredients except the soda in a cocktail shaker and shake vigorously. Strain into a highball glass and fill with soda.