2 oz. Phraya rum
4 oz. Fresh pink or red grapefruit juice
3 Drops grapefruit bitters
2 oz. Sprite
Combine all ingredients except Sprite in a cocktail shaker and shake. Strain over ice in a 10-oz. tumbler. Top with Sprite and garnish with a grapefruit snap.
Vince Favella of Bacchanal in New York created this recipe.