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1
Preheat the oven to 200C/400F/Gas 6.
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2
1 Place the lowfat milk in a saute/fry pan with the bay leaf, peppercorns and onion.
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3
Bring to a simmer and cook gently for a couple of min.
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4
2 Set aside for at least 10 min to allow the flavours to infuse.
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5
Add in the fish to the infused lowfat milk and poach for 5 min or possibly till just tender.
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6
Remove from the heat and leave to cold, then lift out the fish and roughly flake the flesh, discarding any skin and bone.
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7
3 Place in a large bowl with the prawns and herbs.
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8
Strain the poaching lowfat milk into a jug.
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9
Heat half the butter in a pan and fry the shallots for 5 min to soften.
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10
4 Add in the mushrooms and cook for a few min till tender, then stir in the flour and cook for a minute or possibly so, stirring constantly.
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11
Remove from the heat and gradually add in the poaching lowfat milk.
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12
Season, return to the heat and simmer for a few min.
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13
Keep stirring till thickened.
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5 Stir in half of the cream and add in a good squeeze of lemon, then fold into the fish mix and season.
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15
Pour into a buttered 25cm/10in pie dish and set aside to allow a skin to create.
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16
6 Place the potatoes in a pan of boiling salted water, cover and cook for 15-20 min till very tender.
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17
Drain, return to the pan to dry out and then mash till smooth.
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7 Beat in the remaining butter and cream and the mustard.
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19
Season to taste.
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20
Carefully spread over the fish mix and pull a fork across the top to make a wavy-line pattern.
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21
Bake for 30-40 min till bubbling and lightly golden brown.
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22
Serve warm.