Shepherd's pie is a traditional British dish made with minced lamb or beef, mixed with vegetables such as carrots, peas, and onions, and topped with mashed potatoes. The meat and vegetable mixture is cooked in a rich gravy, which adds flavor and moisture to the dish. The mashed potatoes are spread on top and then baked until golden and crispy. Shepherd's pie is a comforting and hearty meal that is perfect for colder months.