oak salted cod in cold water overnight or for a few hours. Drain water, repeat. Heat a large pot of water until boiling. Cook cod for 5 minutes; drain and cool, leaving cod in large pieces. Set aside. Preheat oven to 375°F. In an 8"x 11" casserole dish, layer half the potato slices, all the cod, and all the onions. Top with remaining potato slices. In a small bowl, mix together olive oil, garlic, parsley, pepper flakes, paprika and tomato sauce. Pour evenly over casserole. Bake in preheated oven for 45 min., or until potatoes are tender.