Cut the potatoes into large slices then cut the slices in half. Bring 1 inch of water to boiling in a large skillet. Add sweet potatoes and reduce heat. Cover and simmer for 20 minutes or until potatoes are tender. Drain well.
Meanwhile, for the sauce, in a small bowl combine orange peel, orange juice, molasses or brown sugar, salt, cinnamon and allspice. Pour over the cooked potatoes in the skillet. Bring to a gentle boil and simmer, uncovered, for 5 minutes or until potatoes are glazed, spooning sauce over the potatoes occasionally.