"Pork and chicken would be well-suited to this sweet-and-sour side dish...."
INGREDIENTS
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1 tablespoon extra-virgin olive oil
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1 1 1 pounds kale, ribs removed, coarsely chopped (see Tip)
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2/3 cup water
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2 Granny Smith apples, sliced
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2 tablespoons cider vinegar
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4 teaspoons whole-grain mustard
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2 teaspoons brown sugar
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Pinch of salt, or to taste