Easy One Pan Mediterranean Cod

Name: Easy One Pan Mediterranean Cod
Ingredients: 2 tbsp olive oil; 1 small onion (sliced); 2 cups sliced fennel; 3 large cloves garlic (chopped); 1 14.5 ounce can diced tomato; 1 cup diced fresh tomatoes; 2 cups shredded kale; 1/2 cup water; pinch of crushed red pepper; 2 tsp fresh oregano (or 1/2 tsp dried oregano); 1 cup oil cured black olives; 1 lb. cod (cut into 4 portions); 1/8 tsp salt; 1/4 tsp black pepper; 1/4 tsp fennel seeds (optional); 1 tsp orange zest; fresh oregano (fennel fronds, orange zest, olive oil)