Horseradish Potato Gratin is a rich and creamy side dish that combines the earthy flavors of potatoes with the tangy kick of horseradish. Thinly sliced potatoes are layered with a mixture of cream, horseradish, and cheese, then baked until golden and bubbly. This gratin is the perfect accompaniment to roasted meats or can be enjoyed as a comforting main dish.