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Boil the parsnips and potatoes for 15-20 mins until tender. Drain and mash well with 25g/1oz butter and seasoning. Cover and set aside.
Bring the stock to the boil in a large pan. Tip in the mussels, cover and leave to steam for about 3 mins, or until the shells open. Drain into a colander set over a large bowl to reserve the stock. Remove and throw away the shells and any un-opened mussels. Cover the cooked mussels to stop them drying out.
Melt the remaining butter and fry the onion until softened. Stir in the curry powder and fl our, and cook for about 1 min. Pour in the coconut milk and 3-4 tbsp of the reserved mussel stock and stir well until you have a smooth sauce. Leave to simmer for 5 mins until thickened.
Add the cod to the sauce, return to a simmer and cook for 3-4 mins, stirring occasionally, but trying not to break up the cod. Stir in the mussels, prawns and coriander, season, then tip into a large ovenproof dish. Spread the parsnip mash over the top.
To serve now heat the grill and grill until the mash is golden and crusty. To eat later cool, cover, then chill for a couple of hours. To serve, heat oven to 200C/ fan 180C/gas 6 and bake for 35-40 mins until hot all the way through.