I found this recipe in Elizabeth David's book Summer Cooking. It's so easy to make and goes well with any kind of meat. If you have drippings from a roast left over, you could fry the potatoes in that instead of butter. If you don't eat all the potatoes, save the left overs and make Sunday morning hash browns out of them by chopping them into bite sized pieces and just reheating in a bit more butter or oil in a frying pan for a few minutes. Heaven!