The main ingredient in a traditional quiche is eggs. Quiche is a savory pie that often features a custard filling made from eggs mixed with cream or milk, poured into a pastry crust. While the classic quiche Lorraine includes bacon or lardons, additional ingredients like cheese, vegetables, and herbs can be added to create variations. The dish originated in the German region of Lorraine, from which it derives its name. Quiche has gained popularity as a versatile dish that can be served hot or cold, making it suitable for breakfast, brunch, or a light meal at any time of day.