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Fish pie is usually topped with a layer of mashed potato, but it works equally well encased in pastry.
About the Fish
Fish pie usually has a mixture of different types of fish - choose a white one like cod, an oily one like salmon and a smoked one like smoked haddock. Many supermarkets these days will sell a fish pie mix, which can be quite economical.
Onion
I like my white sauces to have some savoury onion flavour but I don't always want chunks of onion in the sauce so I infuse the milk with onion. To do this, peel and roughly chop an onion, place it in a jug or bowl with the milk and microwave it for a minute or two. Leave to stand for 30 minutes.
Make the Pastry
In a large bowl, mix the salt into the flour. Cut the cold butter into small chunks and rub it into the flour with your fingertips. Stop when the mixture looks like coarse breadcrumbs. Add water a bit at a time - make sure it's all mixed in before you add any more. You only want to add enough water to make the dough come together in a ball. Wrap the dough in plastic film and let it rest in the fridge for at least 30 minutes.
Make the Filling
Check that there are no bones in your fish fillets and place them in a single layer in the bottom of a frying pan. Add the onion-infused milk (but not the onion) and simmer for about 5 minutes until the fish pieces are opaque and flaky. Remove the fish from the pan and separate the fish from any skin. Make a slurry of equal parts cornflour and water and stir it into the milk. Bring it almost to the boil, stirring frequently. The sauce will thicken up and you can add the cream, the fish flakes, prawns, capers, and chopped parsley. Simmer gently for about five minutes, then taste it and add salt and white pepper to taste. Remove from heat and transfer to a cold bowl to cool down.
Assemble the Pie
You'll need a 23cm (9 inch) diameter metal pie dish. Sprinkle some flour on your worktop and roll out a piece of dough into a disc that's a little bigger than your pie dish. Invert the dish over the pastry and trim it up to the edge. This will be the lid of the pie. Set it aside and roll out the remaining dough. Sprinkle the pie dish with semolina, polenta or rice flour and place the pastry over it. Press it down and trim the excess off the edge. Spoon the filling into the pie, moisten the rim of the pastry with water and put the lid on, squeezing it with your thumbs to seal it. Apply any kind of crimping technique you like and glaze the top with eggwash (beaten egg with a splash of milk).
Bake the Pie
Heat your oven to 180°C (356°F) for a fan/convection oven or airfryer, 200°C (392°F) conventional, gas 6. Bake the pie until the top is golden brown, about 35 minutes.
PASTRY 200 grams plain (all-purpose) flour 100 grams unsalted butter 100 ml water pinch of salt FILLING 450 grams fish pie mix 100 grams peeled and cooked prawns 1 medium onion 300 ml milk 2 tbsp double (heavy) cream 2 tsp capers 1 tbsp cornflour (cornstarch) 1 tbsp water small handful flatleaf parsley salt and white pepper to taste