INGREDIENTS
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2½ lb. russet potatoes, peeled
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8 tbsp. unsalted butter, plus more for serving
•
¼ medium head green cabbage, cored and thinly shredded
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1 cup milk
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⅓ cup heavy cream
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4 scallions, green parts only, finely chopped
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Kosher salt and freshly ground black pepper, to taste