Cottage pie is a classic British dish made with ground beef, vegetables, and topped with a layer of mashed potatoes. It is a hearty and comforting meal that is perfect for cold winter nights. The beef is cooked with onions, carrots, and peas in a rich gravy, and then topped with creamy mashed potatoes. The pie is baked until the potatoes are golden and crispy on top. Serve it with a side of green vegetables or a fresh salad for a complete meal.