Ingredients

  • 1 teaspoon butter
  • 1 clove garlic, peeled and split in half
  • 3 cups heavy cream
  • 1/8 teaspoon freshly grated nutmeg
  • 1 1/2 teaspoons kosher salt
  • 1/8 teaspoon white pepper
  • 1/8 teaspoon cayenne
  • 4 medium idaho potatoes (2 pounds)
  • 2 1/2 cups finely grated gruyere cheese (1/2 pound)

Method

  • Preheat the oven to 350 degrees F.
  • Lightly butter a 10-cup gratin dish.
  • Rub the dish with both halves of the cut garlic clove.
  • Combine the cream, nutmeg, salt, pepper, and cayenne in a bowl.
  • Peel the potatoes and slice them paper-thin on a mandoline.
  • As you work, place the potato slices in the bowl with the cream and seasonings.
  • Add the gruyere and combine thoroughly.
  • Pour the potato-cheese mixture into the prepared gratin dish, making sure the potato slices are flat and level.
  • Place the gratin dish inside a roasting pan and fill the pan to three quarters full with hot water, creating a bain-marie.
  • Carefully place the bain-marie in the center of the oven and bake for 2 hours, or until completely set and golden on top.