This recipe is originally from an issue of Bon Apetit. It's very rich and makes a great side dish for a special meal. If you have a Cuisinart, use it, it will make the recipe a snap by eliminating the tedious slicing of the potatoes. Make sure to use a high quality of Gruyere cheese, some are very oily. I use Boar's Head here at home. Also make sure to stick to the amount of cheese listed as too much will make the dish greasy - even if you do use a high quality cheese.