1. In a large sauté pan, sauté onions in oil until soft. Add carrots and water just to cover.
2. Cook over a low flame for about 10 minutes, stirring occasionally. Add rest of vegetables, spices and tomato paste and more water to cover. Raise fire and bring to a boil. Reduce to a simmer and cook for about 25 minutes.
3. Serve over couscous.