Passion Fruit Daiquiri

2/3 cup light rum
1/4 cup lime juice
1/4 cup superfine sugar
4 passion fruits
2 cups crushed ice
1 sliced lime for garnish (optional)

In a blender, combine the rum, lime juice and sugar. Add pulp from the passion fruit (seeds and all). Blend until smooth. Strain out seeds. Return pur e to blender. Add ice a little at a time until the mixture becomes thick and slushy. Pour into glasses and garnish with the lime slices.