Preparation
- Put the potatoes in a large pan of cold salted water and bring to the boil.
- Lower the heat, cover, then simmer gently for 15 minutes until tender.
- Drain, then return to the pan over a low heat for 30 seconds to drive off any excess water.
- Mash with 1 tbsp olive oil, then season.
- Meanwhile put the milk in a large sauté pan, add the fish and bring to the boil.
- Remove from the heat, cover and stand for 3 minutes.
- Remove the fish (reserving the milk) and pat dry with kitchen paper, then gently flake into an ovenproof dish, discarding the skin and any bones.
- Heat the remaining oil in a pan, stir in the flour and cook for 30 seconds.
- Gradually stir in 200-250ml of the reserved milk (discard the rest).
- Grate in nutmeg, season, then bubble until thick.
- Stir in the cream.
- Preheat the oven to 190°C/fan170°C/gas 5.
- Grate the artichokes and add to the dish with the leek, prawns and herbs.
- Stir the lemon zest and juice into the sauce, then pour over.
- Mix gently with a wooden spoon.
- Spoon the mash onto the fish mixture, then use a fork to make peaks, which will crisp and brown as it cooks.
- Sprinkle over the cheese, then bake for 35-40 minutes until golden and bubbling.
- Serve with wilted greens.
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