Remove the meat and place to the side.In the same dish, add the onion, coriander stems and a good pinch of salt, and fry in the spiced oil for 5 minutes. Add the carrots, chickpeas, tomatoes, browned meat, potatoes, and bone broth or water. Stir well. Bring to the boil, then cover and reduce to low. Cook for 2.5-3 hours, adding extra water, if needed. This can also be cooked in a slow cooker for 6 hours, or until tender. The beef should be very tender.