LYONNAISE POTATOES (No. 1)

Cook one onion thickly sliced in three tablespoonfuls butter until delicately browned. Remove onion and keep in a warm place. Add three cups cold boiled potatoes, cut in slices; sprinkle with salt, pepper, and stir until well mixed with butter. Press to one side of spider and let brown richly underneath, then sprinkle onions over potatoes; let heat thoroughly; turn on a hot serving platter, top side down; sprinkle with finely chopped parsley. Cooking the onion separately lessens the danger of burning.