Coat bottom of a large pot with oil. Add spices and cook in the oil for 30 seconds. Add the lamb, onion, garlic, chickpeas and tomato sauce. Add enough broth to simmer the lamb until tender, 1 to 2 hours; the amount of broth and length of cooking time will depend on the quality of the meat and could range form 1 to 2 hours, more broth will be required to cook the meat for the longer period of time. Salt to taste.