INGREDIENTS
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3 1/2pounds russet potatoes, peeled and cut into ¾-inch dice
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1/2teaspoon baking soda
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3tablespoons unsalted butter, cut into 12 pieces
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Kosher salt and pepper
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Pinch cayenne pepper
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3tablespoons vegetable oil
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2 onions, cut into ½-inch dice
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3tablespoons minced fresh chive