With its vibrant colors, punchy flavors, and straightforward technique, a tagine is just the thing to perk up mild white fish. For a bright, flavorful fish tagine, we started by salting chunks of cod to season the flesh and help it retain moisture. We coated the fish in chermoula, a flavorful herb-spice paste of cilantro, garlic, cumin, paprika, cayenne, lemon juice, and olive oil, just before cooking to season its exterior. Softening bell pepper, onion, and carrot before adding the tomatoes…