Easy Baked Cod with Spring Vegetables

Name: Easy Baked Cod with Spring Vegetables
Ingredients: 1 Tbsp lemon zest ((1 lemon yields ~1 Tbsp zest)); 1/2 medium lemon, thinly sliced; 1 bunch asparagus, trimmed and cut into 1-inch pieces; 1 cup cherry tomatoes; 1 medium yellow or orange bell pepper, thinly sliced; 1/2 medium red onion, halved and thinly sliced ((1/2 medium onion yields ~1 cup sliced)); 1/4 - 1/2 cup whole kalamata olives; 2 Tbsp olive oil; 1/2 tsp sea salt; 1/4 tsp black pepper; 3 large cloves garlic, minced; 2 Tbsp chopped fresh parsley; 4 (4-6-oz.) cod fillets ((4 fillets yield 1-1 ½ lbs))