INGREDIENTS
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3 slices bacon
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1 medium onion
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1 teaspoon flour
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1/2 cup water
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1/4 cup cider vinegar
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1 tablespoon sugar
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1 tablespoon mustard
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1/2 teaspoon salt
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1/8 teaspoon pepper
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5 cups cooked potatoes, sliced
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1/4 cup chopped celery
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2 tablespoons fresh parsley, chopped