INGREDIENTS
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4 tablespoons unsalted butter
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1 shallot, sliced thin
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4 sprigs fresh thyme
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4 1/4 cups water
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2 pounds sweet potatoes, peeled, halved lengthwise, and sliced 1/4 inch thick, 1/4 of peels reserved
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1 tablespoon packed brown sugar
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1/2 teaspoon cider vinegar
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Salt and pepper
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Minced fresh chives