Gratin is a cooking technique that involves baking a dish with a browned crust, often created by topping it with breadcrumbs, cheese, or a mixture of both. This method enhances the flavor and texture of the dish, making it crispy on top while keeping the inside tender and flavorful. Common ingredients used in gratins include vegetables, potatoes, and pasta. One popular example of a gratin is Potato Gratin, also known as Gratin Dauphinois, which features thinly sliced potatoes layered with cream and cheese. The dish is baked until golden brown and bubbly, making it a comforting and delicious side dish for various meals.