In this classic dish, thinly sliced potatoes are layered with a distinctive Mornay sauce. Mornay sauce is a Béchamel sauce with the addition of Gruyère cheese. The additions of savory leeks, garlic, and rosemary combine in a wonderful way in the sauce to infuse flavor into every bite. This recipe is a warm, comforting side dish, or hearty enough for the main event!
