INGREDIENTS
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1 egg, slightly beaten
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5 tablespoons cider vinegar
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1 tablespoon Worcestershire sauce
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2 teaspoons hot pepper sauce
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1 1/2 teaspoons onion salt
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1/2 teaspoon celery salt
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1 (3- to 4-pound) chicken, cut into 8 pieces
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2 tablespoons butter
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Instant mashed potato flakes for coating