1 1 / 2 lb / 680 g parsnips, peeled and cut into 1-inch pieces Cold water, to cover Kosher salt, to taste 4 tbsp (60 g) unsalted butter 1 / 2 cup (120 ml) whole milk, warmed 1 / 4 cup (60 ml) heavy cream, warmed 1 small garlic clove, smashed (optional) 1 tsp fresh lemon juice 2 tbsp finely snipped chives Freshly ground black pepper, to taste Pinch of freshly grated nutmeg (optional)
Place parsnips and the smashed garlic (if using) in a saucepan and cover with cold, well-salted water by 1 inch. Bring to a boil, then simmer until very tender, 12–15 minutes. Drain thoroughly and return parsnips to the hot pot over low heat for 1–2 minutes, stirring, to steam off excess moisture. Remove garlic if used. Meanwhile, brown the butter: melt butter in a small skillet over medium heat, swirling, until it turns deep golden and smells nutty, 3–5 minutes. Immediately pour into a heatproof bowl to stop cooking. Purée parsnips with warm milk and cream using a food processor or immersion blender. Stream in 3 tablespoons of the brown butter, season with 1/2 teaspoon salt, pepper, and nutmeg if using. Blend until silky, adding a splash more milk if needed for a smooth, spoonable consistency. Stir in lemon juice and half the chives. Taste and adjust salt and pepper. Transfer to a warm serving dish. Drizzle with the remaining brown butter and sprinkle with remaining chives. Serve alongside the pot roast.
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