Ingredients

• 2 pounds boiling potatoes, peeled and cut into 1-inch pieces
• 1 pound celery root, peeled and cut into 1-inch pieces
• 5 tablespoons unsalted butter, cut into pieces
• 1/2 cup milk
• 2 teaspoons fresh lemon juice
• 1 teaspoon salt, or to taste
• Freshly ground pepper to taste

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Instructions

1. In a large saucepan combine the potatoes and enough salted cold water to cover them by 2 inches. Bring the water to a boil, and boil the potatoes, covered, for 4 minutes. Add the celery root, simmer the vegetables, covered, for 10 to 15 minutes, or until they are very tender, and drain them well. While the vegetables are still hot force them through a food mill fitted with the medium disk into a saucepan. Add the butter, milk, lemon juice, salt and pepper, and stir the puree well. (The puree may be made up to 1 day in advance and kept covered and chilled.) In a heavy saucepan reheat the puree over low heat, stirring constantly, until it is hot.;