The main ingredient in a shepherd’s pie is minced lamb, which is the key feature of this traditional dish. Shepherd's pie typically consists of a savory filling made from ground lamb, mixed with vegetables such as peas, carrots, and onions, all simmered in gravy or broth. The mixture is then topped with a layer of creamy mashed potatoes before being baked until golden brown and bubbling. While the name refers specifically to the use of lamb (as opposed to cottage pie, which uses beef), the dish remains a hearty comfort food, celebrated for its rich flavor and satisfying texture.