Step 1Place the sugar and 1 cup water in a medium saucepan over low heat and stir until the sugar is dissolved. Add the orange juice and orange rind and stir to combine.
Step 2Pour the mixture into a shallow (11-by-17-inch) glass baking dish, cover with plastic wrap and place in the freezer for 1 hour.
Step 3After 1 hour, use a fork to rake the top of the granita. Return to the freezer for another hour. Repeat every hour for 3 to 4 hours or until set.
Step 4Top the granita with passion fruit and serve.