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Heat oil over medium high heat in large, flat-bottomed skillet.
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Slice potatoes and squash into rounds.
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Slice onions and separate into rings.
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Layer in hot oil, starting with potatoes.
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Sprinkle each complete layer (potatoes, squash, and onion) lightly with flour, salt and pepper.
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Continue to fry, turning occasionally for even browning. Drain on paper toweling.