INGREDIENTS
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2 pounds rutabaga (yellow turnip), peeled and cut into 2- inch pieces
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2 pounds Yukon gold potatoes, peeled and quartered
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12 tablespoons unsalted butter, at room temperature
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1 1/2 cups half-and-half, warmed Kosher salt
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1 tablespoon extra-virgin olive oil
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1 1/2 tablespoons finely grated lemon zest
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8 scallions, white and green parts, chopped, plus extra, whole, for garnish
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1/3 cup finely chopped fresh parsley
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1 1/2 cups fresh, unseasoned breadcrumbs