Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Preheat oven to 190C 170C/fan, boil potatoes unitl tender, whilst potatoes are cooking put fish into saucepan with 450ml of milk and sprig of parsley, cover and bring to a simmer as soon as milk starts simmering, turn off the heat, leave covered for 10 minutes.
step 2
Drain potatoes and mash, chop remiang parsely and add to mash, with rest of milk and 5g of butter, season with black pepper.
step 3
Flake the fish into oven proof dish and add the peas, strain the milk into jug, gently melt the ret of the butter and fry the leek for 5 minutes, add the flour stirring for a few mintues, then slwly pour in the strained milk stirring continuously until sauce thickens.
step 4
Season the sauce and piur over fish, cover with the mash sprinkle over the cheese and cook for 35 minutes or until golden.