In casserole, combine sugar, reserved juice and corn syrup.
Arrange five pineapple slices in single layer over sugar mixture.
Microwave on HIGH 8 to 12 minutes or until sugar dissolves and slices are glossy and transparent on edges, turning over and rearranging every 4 minutes.
Remove slices to wire rack and cool to become more transparent.
Add remaining slices to hot syrup and repeat procedure.
When slices have cooled completely, coat with sugar.
Cover with wax paper and let stand on wire rack to dry.
Re-coat with sugar. Slices will be slightly sticky.