Ham and Sweet Potato Skillet

1/4 cup chopped onion
4 tablespoons butter or margarine
2 tablespoons flour
1 can (15 oz.) pineapple chunks, drained, reserve syrup
1/3 cup water
1/3 cup brown sugar, firmly packed
1 can (29 oz) sweet potatoes, drained and sliced
1 fully cooked ham steak, cut in serving-size pieces

Cook onion in butter or margarine for 2 to 3 minutes; stir in flour. Add reserved syrup and water. Cook, stirring constantly, until thickened. Stir in pineapple and brown sugar; top with potatoes and ham pieces. Cover and simmer for 20 to 25 minutes.
Serves 4.