2/3 cup light rum
1/4 cup lime juice
1/4 cup superfine sugar
2 cups crushed ice
1 sliced lime for garnish (optional)
In a blender, combine the rum, lime juice, and sugar.
Add peeled and chopped guavas. Blend until smooth.
Add ice a little at a time until the mixture becomes thick and slushy.
Pour into glasses and garnish with the lime slices.