In a large saucepan cook garlic in hot oil for 1 minute, stirring frequently. Add broth and olives; bring to boiling. Stir in couscous, zucchini, shredded lemon peel, and pepper. Cover; remove from heat. Let stand 5 minutes.
To serve, gently stir in green onions and parsley. If desired, top with thin strips of lemon peel. Serve with lemon wedges. Makes 8 side-dish servings.