This week’s recipe for Scalloped Potato Skillet Gratin with Gruyère, Leeks, and Black Pepper is not exactly weeknight friendly, as Melissa readily admits. However, it is the lushest, cheesiest potato dish ever and perfect for the Thanksgiving table. Pour yourself a beverage, put on some music and begin. Plus, mandoline basics, how to check seasoning with your hands, and tips on tempering eggs. And did we mention that you can make this ahead?