Heat lard in heavy skillet (bacon drippings or other fat or oil may be used). Arrange in skillet a layer of potatoes, then one of onions; repeat.
Sprinkle with salt and pepper. Sauté, covered, over low heat, about 15 minutes. Uncover; increase heat slightly and sauté 10 minutes longer, or until potatoes are crisp and brown on underside. Do not stir.