Cut potatoes in half lengthwise, then into 2-inch pieces. Place in an ungreased 8-inch square baking dish. In a small saucepan, combine the orange juice, sugar, raisins, butter, cornstarch and salt. Cook over medium heat, stirring constantly, until thickened and bubbly. Cook and stir for 2 minutes longer. Pour over potatoes. Sprinkle with nuts. Bake, uncovered, at 350° for 20 minutes or until bubbly.