The combination of orange juice with sweet potatoes is outstandingly delicious! My mother was a great cook. Her dishes always had plenty of exciting flavors. I'm passing on one of her favorites which we enjoyed.
Boil sweet potatoes for 30 minutes. Let potatoes cool and then peel. Cut into quarters.
Place in a large saucepan and add butter, orange juice, syrup and sugar.
On top of stove cook at low heat for about 1 3/4 hours to glaze potatoes. Tilt saucepan often to coat all potatoes. Place oranges slices in pot 30 minutes before serving. (She never used a crock pot, but I bet it would work as well.) Freezes well -- just reheat and serve.