Rosti-topped fish pie

Rosti-topped fish pie

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(37 ratings)

Prep: 15 mins Cook: 25 mins


Serves 2
Fish pie without the fuss - a good recipe for frozen white fish such as coley

Nutrition and extra info

Nutrition: per serving

  • kcal533
  • fat26g
  • saturates15g
  • carbs45g
  • sugars10g
  • fibre4g
  • protein34g
  • salt1.23g
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  • 300g waxy potato, halved



    The world's favourite root vegetable, the potato comes in innumerable varieties. A member of…

  • 250g skinless coley fillets (look out for frozen coley)
  • 300ml milk



    One of the most widely used ingredients, milk is often referred to as a 'complete' food…

  • 50g butter



    Butter is a dairy product made from separating whole milk or cream into fat and…

  • 1 leek, finely sliced



    Like garlic and onion, leeks are a member of the allium family, but have their own distinct…

  • 25g flour



    Flour is usually made from grinding wheat, maize, rye, barley or rice. As the main…

  • 2 tbsp chopped parsley



    One of the most ubiquitous herbs in British cookery, parsley is also popular in European and…

  • 2 tsp Dijon mustard


  1. Cook the potatoes in boiling salted water for 5-7 mins, until almost tender but firm enough to grate. Drain and refresh under cold running water. Put the coley in a shallow saucepan and pour over the milk. Bring to a simmer and cook for 5 mins. Drain the fish, reserving the milk, then set aside.

  2. Heat half the butter in a medium saucepan, add the leek, then cook for 5-6 mins until softened. Stir in the flour for 1 min, then remove from the heat. Gradually add the milk, stirring well between each addition. Return to the heat and stir until the sauce comes to the boil. Simmer for 2 mins, then stir in the parsley and mustard.

  3. Heat the grill to high. Flake the fish into large chunks, fold into the sauce, then place in a small ovenproof dish. Coarsely grate the potatoes. Melt the remaining butter, toss with the potatoes, season and scatter over the dish. Place under a medium grill for 5-10 mins until the potatoes are golden and tender.

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Comments, questions and tips

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Angela Swinkels's picture
Angela Swinkels
14th Aug, 2018
Awesome recipe. I added 1/2 leek, 1/2 red capsicum, 3 big mushrooms to the mix and used a little less butter. Still big thumbs up, even for my picky 3-yr-old eater
15th Oct, 2016
Great tasting pie, added peas to the mix & a little cheese to the topping. Will make again.
10th Oct, 2016
really tasty. we added peas and used a fix pie mix of cod, smoked haddock and salmon. we really enjoyed the rosti top so will definitely make again
22nd Apr, 2014
Liked the rosti topping but found the coley and sauce uninspiring.
11th Apr, 2014
The nicest fish pie EVER! Fully recommend this! The sauce was deliciously thick, and with the addition of a few extra veggies, it tasted simply awesome! I used Pollack, prawns, salmon and smoked haddock = simply delicious!!!! (top tip - use loads of freshly ground black pepper in the sauce). I will never use mash on top again - the gratin is a much better choice! It converted a family of fish pie haters - need I say any more....?!?
21st Mar, 2014
Chose to try this recipe because it's much quicker to make than my usual. Took me about 30mins so fine for a mid-week meal. It was rather nice, having taken on board comments from others, I added hard boiled egg (like Delia Smith in her luxury fish pie recipe) and prawns. The sauce thickened really easily, and the leeks and mustard were a welcome change. I was surprised how tasty coley was! Will be making this one again.
11th Dec, 2012
Absolutely delicious! This has so many good points: easy to cook, cheap ingredients (I used frozen coley), low calorie and filling - I aimed to cook about half the quantity given in the recipe, as I live alone, and still ended up finding half of what I'd cooked was plenty!
15th Oct, 2012
Just made this not cooked it yet but WOWSER it looks fab!!!!
28th Feb, 2012
Really nice dish, rosti style topping adds a great texture over mash and the mustard adds a lovely heat and flavour.
13th Jan, 2012
The first fish pie I've ever made! I used onions instead of leaks and twice as much wholegrain mustard as specified. I also added 2 quartered boiled eggs as seen egg included in other recipes. It was rather lovely :)


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