shrimp with tomatoes and warm spices

Name: shrimp with tomatoes and warm spices
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Cuisine: Mediterranean, Moroccan, African
Ingredients: 1-pound large shrimp (26 to 30 per pound), peeled and deveined; 2 tablespoons extra-virgin olive oil, divided, plus extra for drizzling; 5 garlic cloves, minced, divided; 1 teaspoon grated lemon zest; 1/2 teaspoon table salt, divided; 1/8 teaspoon pepper; 1 red or green bell pepper, stemmed, seeded, and chopped; 1 small onion, chopped; 1 tablespoon ras el hanout; 1/2 teaspoon ground ginger; 1 (28-ounce) can whole peeled tomatoes, drained with juice reserved, chopped coarse; 1/4 cup pitted black olives, chopped coarsely; 2 tablespoons coarsely chopped fresh parsley; 2 scallions, sliced thin on bias; 1 package couscous