Potato and parsnip gratin is a delicious and comforting side dish that combines the earthy flavors of potatoes and parsnips with a creamy and cheesy sauce. The dish is made by layering thinly sliced potatoes and parsnips in a baking dish, then pouring a mixture of cream, garlic, and cheese over the top. The gratin is baked until golden and bubbly, creating a crispy and creamy texture. It is the perfect accompaniment to any roast or grilled meat, and is sure to be a hit at your next dinner party.