Apple Walnut and Potato Gratin is a delicious and comforting side dish that combines the sweetness of apples with the earthiness of potatoes and the crunch of walnuts. The dish is layered with thinly sliced apples and potatoes, then topped with a creamy and cheesy sauce. It is baked until golden and bubbly, creating a perfect balance of flavors and textures. This gratin is a great addition to any meal and is sure to impress your family and friends.