I had some pollack and sea bass bits from summer; not enough for single meals, but with a few other bits enough for a fish pie.
Here it is:
The pastry is simple shortcrust with the addition of an egg yolk. The filling is the pollack and sea bass skinned and cut into bite sized chunks with a handful of king prawns and 1/2 doz scallops in and onio, mushroom, sweetcorn and mustard sauce.
I cooked the fish pieces in an open pan and when cooled added them to a bowl with the prawns and scallops. The sauce is a finely chopped medium onion softened in butter followed by the mushrooms, sweetcorn and mustard (powder or from a jar) and seasoning - I also crumbled in half a chicken stock cube. Pour in about 300ml of milk, but the amount will vary depending on the amount of fish and how big your pie, and thicken slightly with flour.
Place the fish ingredients in an oven proof dish and pour over the sauce. Let it cool and top with the pastry. Cook at 160 -180 until the crust is cooked and golden - about 30 - 40 mins.