Diamond Martini
- 15 ml (1/2 oz.) citrus liqueur
- 15 ml (1/2 oz.) blackcurrant liqueur
- 15 ml (1/2 oz.) hazelnut liqueur
- 10 ml (1/3 oz.) lemon juice
- Club soda
- Ice cubes
- 1 blackberry
Pour all the ingredients, except for the club soda and blackberry, into a martini glass containing a few ice cubes.
Top up with club soda.
Garnish with the blackberry on a cocktail pick.