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Use any sustainably sourced fish you fancy in this crispy golden pie.

Instead of mash potato, this fish pie is topped with crispy potatoes! This pie can be frozen, so you'll always have a nutritious meal to hand. 

skinless fish fillets, cut into 2cm chunks, we used salmon, smoked haddock and cod

Prepare to end of step 3, leaving the white sauce and rösti topping to cool completely before assembling. Wrap dish well and freeze for up to 1 month. To serve, defrost overnight in fridge before completing recipe.