A gratin is one of the classic French dishes that typically consists of potatoes, cream, cheese, and sometimes butter. The dish is named for the way it is cooked, in a shallow dish with a browned and bubbly top. Potato gratin can be pressed until cold, portioned, and roasted in an oven. Gratins can be made with different kinds of potatoes, including sweet potatoes, yams, and even pumpkin. In addition to the traditional potato gratin, there are also many other variations out there, including spinach gratins and broccoli gratins. No matter what ingredients you use, the key to making a perfect gratin is all in the cooking method. Be sure to cook your gratin slowly and evenly so that the cheese or butter melts into a bubbly golden brown topping that will have everyone coming back for seconds.