Zwiebel Auflauf is the german name of 'Onion Gratin'. Wide-ranging claims have been made for the effectiveness of onions against conditions ranging from the common cold to heart disease, diabetes, osteoporosis, and other diseases. They contain chemical compounds believed to have anti-inflammatory, anticholesterol, anticancer, and antioxidant properties such as quercetin. 

While gratin is a culinary technique in which an ingredient is topped with a browned crust, often using breadcrumbs, grated cheese, egg and/or butter. In a shallow dish of some kind, a gratin is baked or cooked under an overhead grill or broiler to form a golden crust on top and is traditionally served in its baking dish. So now enjoy this video of how you can make this wonderful comfort food :)