Place a large, heavy bottomed pot over medium heat. Stir in the cumin, ginger, cloves, cayenne, cardamom, coriander, and allspice; gently toast until fragrant, about 2 to 3 minutes. Stir in oil and onion, cook until softened. Stir in the bell pepper, and zucchini; cook for 5 minutes. Stir in the raisins, salt, zest, and garbanzos.
Pour in the chicken broth and orange juice; turn heat to high and bring to a boil. When the mixture is boiling, stir in the couscous and remove from heat; cover, and let stand 5 minutes. Fluff with a fork, and fold in chopped mint.