INGREDIENTS
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1 1/2 pounds red potatoes, scrubbed well and quartered
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1/2 head medium cauliflower, cored and cut into florets
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Kosher salt
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1 large leek, pale green and white parts only, chopped
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2 tablespoons olive oil
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Freshly ground black pepper
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1 bunch kale, stems removed and chopped (6 ounce bunch)
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3/4 cup whole milk
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1/3 cup sour cream
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1/4 cup freshly grated Parmesan
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2 tablespoons butter, cut into pats