Kleftiko means 'stolen' in Greece, and it refers to the days when bandits roamed the hills and if they managed to steal a goat or sheep, they would cook it in a hole in the ground so that no aroma, smoke or steam could escape to give away their location. Lamb kleftiko is cooked for several hours, until the meat is falling off the bone. It's really easy to make, and really tasty.
Salt and ground black pepper to taste. Lamb shanks or shoulder are best for this dish - they really benefit from the loooong cooking time. Leg of lamb is okay, but wouldn't be quite as unctuous.