Provençal Potato Gratin
The potatoes can be prepared 4 hours ahead. Cover and reheat in a 325° oven.
When Lydie Marshall doesn't have any fat or pan juices in her refrigerator, she brings a jar to her butcher, who roasts chickens on a spit, and he fills it with fat and juices. If you're not a regular customer, you might have to buy a chicken, too, the first time.