Potatoes Anna
["1 large onion", "6 medium potatoes (2 lb.)", "4 medium sweet potatoes (2 lb.)", "1/4 c. salad oil", "margarine or butter", "salt and pepper"]
["About 1 1/2 hours before serving, chop onion.", "Peel and slice white and sweet potatoes, keeping in separate piles.", "In a nonstick 10-inch skillet with ovensafe handle (or wrap with double thickness of heavy duty foil) in hot salad oil, cook onion until tender. With a slotted spoon, remove onion to bowl and set aside.", "In remaining oil in skillet, arrange white potatoes in layer, overlapping slices.", "Sprinkle sauteed onions over potatoes.", "Dot with 2 tablespoons margarine or butter and sprinkle with 3/4 teaspoon salt and 1/4 teaspoon pepper.", "Arrange sweet potato slices over white potato layer.", "Dot with butter, salt and pepper, and add onion as with white potatoes.", "Continue layers until potatoes run out."]
["onion", "potatoes", "sweet potatoes", "salad oil", "margarine", "salt"]