Hurricane Cocktail

Combine orange juice, light rum, dark rum, passion fruit nectar, grenadine (or cherry juice) and lime juice in a cocktail shaker. Add ice. Cover and shake vigorously until chilled, about 30 seconds. Strain the mixture evenly into 2 ice-filled hurricane glasses. Top each with ¼ cup sparkling water. Garnish with a cherry and an orange slice, if desired.