Saute lamb in oil for 10 minutes. Add onions, carrots and pepper. Saute for 10 minutes. Add tomato paste, salt, pepper, cayenne, cumin, coriander, and broth. Lower heat and simmer for 1 hour. Add potatoes and garlic and simmer for 15 minutes. Add cilantro and parsley, simmer for 2 minutes. Serve with pita bread.