Braised Fish With Spicy Tomato Sauce

Name: Braised Fish With Spicy Tomato Sauce
Ingredients: 1 tablespoon paprika; 2 teaspoons ground coriander; 1 ½ teaspoons ground cumin; ¼ teaspoon ground cinnamon; ¼ teaspoon cayenne; 3 tablespoons olive oil; 4 cloves garlic, grated or finely chopped; ¼ cup tomato paste; 5 ounces frozen chopped spinach (from a 10-oz. pkg.); 2 teaspoons sugar; 1 ¼ teaspoons kosher salt; Freshly ground black pepper; 4 frozen skinless cod fillets or other white fish, such as sole, flounder, snapper, or wild Alaska pollock (about 1½ lb. total); 1 teaspoon lemon zest (from 1 lemon); Fresh cilantro leaves, for serving; Cooked couscous, for serving