To make the tomato sauce: Heat a large frying pan over high heat. Add all the sauce ingredients to the pan. Stir well and bring to the boil then reduce the heat and simmer for a couple of minutes.
To cook the fish: Season the fish with a little salt and black pepper. Then place the fillets on top of the gently simmering sauce. Cover and leave to cook for 15 minutes until the fish is cooked through. Sprinkle over the parsley.
To serve: Serve the hake with the tomato sauce, mashed potatoes and a green salad.