Instructions

  1. Cook fettuccine in a 6- to 8-quart pot of boiling salted water* until al dente.
  2. Reserve 1/4 cup cooking water, then drain pasta in a colander.
  3. Melt 3/4 stick (6 tablespoons) butter in a 2- to 3-quart flameproof gratin dish over low heat.
  4. Add cooked pasta and toss to coat, lifting strands.
  5. Add cheese, reserved cooking water, cream, remaining 3 tablespoons butter (thinly sliced), salt, and pepper and toss to combine well.
  6. Sprinkle with additional cheese and serve immediately.
  7. *When salting water for cooking, use 1 tablespoon salt for every 4 quarts of water.