Saute onions & scallions in 1/2 stick of margarine. In bottom of steamer. add tomato paste, salt, pepper, cayenne, paprika, and a little water. dice potatoes. Add chickpeas, potatoes and meat to bottom half of steamer, cover with water and place on top part of steamer. Moisten couscous with water, place in upper portion of steamer. When steam begins to rise from coucous, add rest of margarine, cover cook 15 minutes. Transfer couscous to bowl, add 1 cup water, crumble by hand. replace in steamer, cook for 30 more minutes. add another cup water, crumble, replace in steamer. Cook until tender, meat will be done at same time.