Pineapple Rum Punch

1.Fill a short cocktail glass with ice.
2.Pour in the grenadine and let it settle to the bottom of the glass.
3.In a cocktail shaker add ice, white rum, pineapple juice, and orange juice. Shake until cold.
4.Strain juice and rum mixture into the prepared cocktail glass. Garnish with extra pineapple or orange pieces.