"Potatoes and scallions join forces...."
INGREDIENTS
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6 large scallions
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3 pounds russet potatoes (5 to 6 medium)
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1/2 cup heavy cream, divided (optional)
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3 teaspoons kosher salt, plus more for the milk
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1 1/4 cups whole milk
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5 tablespoons salted butter, preferably Kerrygold, divided
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3/4 teaspoon ground white pepper