1. Season the meat with salt and pepper and brown in a little hot oil in a pot. Add the onion or leeks, garlic, celery and carrots and sauté until the vegetables are soft.
2. Mix the tomato paste with the harissa/curry paste and mix with the meat and vegetables.
3. Add the rest of the soup ingredients. Bring to the boil, then simmer for about 2 hours – the meat should start coming off the bones.