There are few dishes in the world more deeply satisfying than a perfectly made Potato Gratin. And by perfectly made, I mean the potatoes are cooked just until tender (not falling apart), are enveloped in a creamy (not curdled) sauce, and are well-seasoned, (not bland). Of course, it goes without saying that you should use a copious quantity of cheese and it should be excellent quality and aged to boot. In a dish this simple, each ingredient counts.