- 75 ml (2 1/2 oz.) citrus liqueur (like blue curaçao)
- 45 ml (1 1/2 oz.) dry gin
- 120 ml (4 oz.) tonic water
- 30 ml (1 oz.) lime juice
- Ice cubes
- 1 lemon slice
Combine all the ingredients, except for the tonic water, in a shaker filled with ice cubes.
Shake vigorously for 8 to 10 seconds.
Strain into a highball glass containing a few ice cubes using an ice strainer.
Top with the tonic water.
Garnish with lemon slice.