Cod in Puttanesca Sauce

Name: Cod in Puttanesca Sauce
Ingredients: 4 large cod fillets, patted dry; ground Himalayan pink salt, to taste and divided; freshly ground black pepper, to taste and divided (I always use mixed peppercorns); 1 tbsp. olive oil; 1/2 cup yellow onions, chopped; 2 ounces (1 can) anchovies in olive oil; 1/4 tsp. red pepper flakes, or to taste; 1 can (2.25 oz.) sliced black olives, drained (*see footnote); 1/4 cup capers, rinsed and drained; 4 large cloves garlic, pressed; 1/2 cup dry white wine such as Pinot Grigio or Chardonnay; 4 cups (about 8) Roma tomatoes, concassées; 1 tsp. Italian seasoning; 1/4 cup chopped parsley, for garnish