1.0 fl. oz. of White Rum
1.0 fl. oz. of Grand Mariner
2.0 fl. oz. of Grapefruit Juice
Ice
Bitter Lemon
Suggested Garnish
Mixing Procedure
Combine all ingredients (except Bitter Lemon) in a cocktail shaker with the ice, shake, strain into a highball glass filled with ice, top with Bitter Lemon.