To create a memorable Christmas roast, choose a high-quality meat like a tender beef tenderloin or a succulent roast lamb. Begin by seasoning the meat generously with salt, pepper, and any desired herbs or spices. Roast it at a suitable temperature and follow Nigella's technique of basting the meat with its own juices or melted butter to enhance flavor and keep it moist. Let it rest before carving, and serve with delicious accompaniments like roasted vegetables and rich gravy.