adapted from The Featherstone Farm Cookbook
1 clove garlic
1 tsp butter
4 cups red-skinned potatoes, peeled and sliced 1/8” thick
1 1/2 cups minced leeks, white and pale green parts only (2 to 3 medium leeks thinly sliced crosswise, then minced)
Salt and freshly ground black pepper
1/2 cup whole milk or heavy cream
1/2 cup chicken/veggie stock
3/4 to 1 cup grated swiss cheese
Directions: Preheat the oven to 325 F. Cut the unpeeled garlic clove in half. Rub the bottom and sides of a glass 9×9 pan or ceramic oval gratin dish with the cut clove. Let the garlic juices dry, then grease the dish with butter. Arrange one-third of the potatoes in the dish, and top them with half of the leeks. Season with salt and pepper. Add another third of the potatoes, then the rest of the leeks. Season again with salt and pepper. Top with the remaining potatoes. Season with salt and pepper. Whisk the cream and stock together and pour them over the potatoes. Cover the dish with aluminum foil and bake 30 minutes.
Uncover the dish. Press the potatoes down lightly with a spoon and baste them with some of the liquid so that the surface is moist. Raise the oven temperature to 375 F. Sprinkle the surface of the potatoes evenly with the cheese. Return the gratin to the oven uncovered and continue baking until it is well-browned, about 25 to 30 minutes.