Ballycotton fish pie

1.25kg fillets of cod, haddock, ling, hake, salmon or pollock or a mixture, skinned

salt

pepper

600ml full cream milk and a little cream

1-2 slices onion

3-4 slices of carrot

1 small bay leaf

a sprig of thyme

3 peppercorns

18 cooked mussels (optional)

roux (30g butter, 30g flour)

4 eggs, hard boiled

15g butter

120g onion, chopped

170g sliced mushrooms, preferably flat

2 tbsp parsley, chopped

900g fluffy mashed potato or champ