1/2 oz light rum
1/2 oz dark rum
1/2 oz Blue Curacao liqueur
1/2 oz grenadine syrup
1/2 oz fresh lime juice
1/2 oz club soda

Pour the light rum, dark rum, blue curacao, grenadine and fresh lime juice into a cocktail shaker half-filled with ice cubes. Shake well, and strain into a cocktail glass with a small amount of crushed ice. Add the club soda. Garnish with an almond-embedded slice of lime, and serve.