Candied Pineapple Rings

2 cups sugar
1 cup water
1/3 cup corn syrup
2 cans sliced pineapples

Combine sugar, water and corn syrup in saucepan. Cook over moderate heat until mixture spins a thread (234 degrees on a candy thermometer). Drop in a few slices of well-drained pineapple, being careful not to crowd the slices. Simmer slowly until pineapple becomes clear, about 15 to 29 minutes. Remove pineapple from pan and drain on wire racks. Continue until all pineapple is candied.