For a more intense mint flavor, bruise the mint leaves slightly before adding them to the syrup. Adjust the amount of sugar to your liking depending on the sweetness of the cantaloupe. If you don't have superfine sugar, you can use regular granulated sugar. Just make sure it dissolves completely in the water. For a smoother texture, you can use an ice cream maker according to the manufacturer's instructions. The Italian ice can be stored in the freezer for up to a week. If it becomes too hard, let it thaw slightly before serving.