Arrange the fish steaks in a ring on a dinner plate. Divide half the butter into 4; put a small knob onto each fish steak. Season with salt and pepper and cover with cling wrap. Microwave on Full power for 3 1/2 minutes. Set aside. Microwave the remaining butter in a 1 3/4 pint jug for 1 minute on Full Power. Stir in flour and then gradually stir in the milk; season to taste. Microwave on Full Power for 2 minutes. Beat well. Microwave on Full Power for a further 2 minutes. Beat in the cheese. Cut the fish into bite size pieces and arrange in a suitable dish with the shrimps. Pour the sauce evenly over the fish. Sprinkle with the crispy crumbs. Microwave on Power 4 for 7 minutes. Serve immediately, garnish with tomato and parsley. Crispy Topping: Put the butter into a 3 pint mixing bowl and microwave on Full Power for 1 1/2 minutes. Stir in the breadcrumbs and oatmeal. Microwave on Full Power for 2 1/2 minutes. Stir . Microwave on Full Power for 2 minutes. Allow to stand for 5 minutes before using. Alternatively, the topping may be cooled and stored in an airtight container. Serve as a crispy finish for sweet and savoury dishes. Posted to rec.food.recipes by Ms Flora Bay on Thu, 2 Mar 1995.