INGREDIENTS
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116.9-ounce boxfrozen potato-and-onion pierogi
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1 tablespoon olive oil
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1 small yellow onion, cut into rings
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1 crisp apple (such as Braeburn or Gala), cut into 1/2-inch pieces
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1/4 small head green cabbage, shredded
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1 tablespoonapple cider vinegar
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kosher salt and black pepper
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1/3 cup sour cream