Peel the potatoes, cut into slices and boil in salted water until almost. Chop into slices and stew in the butter, until soft but not fry. In a round cookie cutter rank potatoes and onions in the form of a tower, alternating row potatoes, onions row and sprinkle with spices. Bake to golden in a suitable container for 10-15 minutes in a preheated 180 C oven. Serve as a side dish to lamb or other meat.