For the white sauce, melt the butter in a pan over a low heat, add flour and cook for 5 mins, stirring. Meanwhile, place the milk in a pan with the bay leaf and cloves and bring to just below the boil. Pour the milk into the flour mix a little at a time, stirring continually, season and cook out for 5 mins.
To finish the sauce, melt the butter in a pan and add all the vegetables. Cook for 5 mins without colouring, add wine and reduce by two thirds. Add the white sauce and cream and simmer for 2 mins, stirring continually. Remove from heat.
For the mashed potato, cook the potatoes in simmering water until cooked, drain thoroughly and mash, adding the butter, ½tsp salt and the warm milk. Once smooth, remove from heat, add nutmeg and egg yolks. Put mash into a piping bag fitted with a star nozzle.
To finish, add the fish to the hot sauce, cook lightly for 30 secs, then add mussels, shrimps and chives. Divide between 4 pie dishes and pipe with potato. Sprinkle with grated cheeses, put a langoustine head in the middle of each pie and bake at 180C/Gas 4 for 15 mins until golden, then sprinkle with chives and serve.
Tip: If you can't get scallops or langoustines, use monkfish and king prawns instead.
Recipe by appetite magazine at https://www.appetitemag.co.uk/north-shields-fish-pie/