In 1-quart saucepan, place cornstarch. Gradually stir in reserved 1 cup pineapple juice. Cook over medium heat, stirring constantly, until thickened and bubbly. Cook and stir 2 minutes longer. Cool completely, about 30 minutes. Fold in reserved 1/2 cup pineapple, the papaya and kiwifruit. For servings, cut dessert into 5 rows by 3 rows. Serve with fruit mixture. Store covered in refrigerator.