You will need to increase or decrease quantities depending how many people you are feeding.
Serves 2.
3 - 4 tablespoons fresh breadcrumbs.
1/2 small'ish onion, finely chopped.
A knob of butter, softened.
1 teaspoon curry paste.
Scant teaspoon wholegrain mustard.
A dash of Worcestershire sauce.
Mix ingredients together in a bowl. Spread the mixture on raw cod or haddock fillets and bake on 200c/gas mark 6 for 20 minutes.
I don't know how this would work with oily fish such as mackerel or tuna steaks but it's not suitable for delicately flavoured fish, such as plaice.