Ingredient

• 4 (about 2 pounds) Yukon gold potatoes
• Salt
• 1 tablespoon unsalted butter
• 1/2 cup hot milk, or more as needed
• Freshly ground black pepper
• 1 teaspoon white-truffle oil

• Step 1

  Place whole unpeeled potatoes in a saucepan of cold water. Add salt, and bring to a boil. Reduce heat, and simmer until tender when pierced with the tip of a small knife, about 40 minutes. Drain.

• Step 2

  When cool enough to handle, peel potatoes, and put through a ricer or food mill fitted with the finest blade. Beat in butter with a wooden spoon. Beat in hot milk little by little until a smooth, creamy consistency is achieved. Season to taste with salt and pepper. (If making ahead of time, keep in a heat-proof bowl, covered with aluminum foil, set over a pot of hot water. You may need to add additional hot milk to thin).

• Step 3

  Just before serving, whisk 1/2 teaspoon truffle oil into potatoes. After serving potatoes, make a little well in each portion and drizzle 1/4 teaspoon oil on top.