African Stew

4 small kohlrabies, peel & cut in chunks
2 sweet potatoes, peel & cut in chunks
1 large onion, chopped
2 zucchini, sliced thick
5 fresh tomatoes or 16 oz. canned
15 ounces garbanzo beans, liquid included
1/2 cup couscous, or bulgar wheat
1/4 cup raisins, dark or golden
1 teaspoon ground coriander
1/2 teaspoon ground turmeric
1/2 teaspoon ground cinnamon
1/2 teaspoon ground ginger
1/4 teaspoon ground cumin
3 cups water

Combine all the ingredients in a large saucepan.
Bring to a boil, lower the heat, and simmer until the vegetables are tender, about 30 minutes.