Heat sugar and 1 1/4 cups water in a saucepan over medium heat 5 minutes or until sugar dissolves and reaches a syrup consistency.
Process crushed pineapple, frozen strawberries, lemonade concentrate, and orange juice concentrate, in batches, in a blender until smooth. Stir in sugar syrup, and freeze at least 8 hours.
Remove from freezer, and let stand 30 minutes or until mixture can be broken into pieces. Stir in sparkling water, and serve immediately.