INGREDIENTS
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1 tablespoon extra-virgin olive oil
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1-1 1/2 pound kale, ribs removed, coarsely chopped (see Tip)
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2/3 cup water
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2 Granny Smith apple, sliced
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2 tablespoon cider vinegar
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4 teaspoon whole-grain mustard
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2 teaspoon brown sugar
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pinch of salt, or to taste