
Fish pie is usually topped with a layer of mashed potato, but it works equally well encased in pastry.

200 grams plain (all-purpose) flour
100 grams unsalted butter
100 ml water
pinch of salt
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