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Heat oven to 180C/160C fan/gas 4. Bring a large pan of water to the boil and blanch the cauliflower for 3-4 mins until al dente. Drain and set aside.
Heat a non-stick frying pan and cook the chorizo for a couple of mins to brown, then remove from the pan with a slotted spoon, leaving the oil behind. Melt the butter in the pan, then add the flour to make a roux. Pour in the milk gradually, whisking constantly, until smooth. Add the Gruyère, stir until melted, then season.
Put the cauliflower in a baking dish (or divide between individual dishes) with the chorizo and cod. Spoon over the cheese sauce and sprinkle with the breadcrumbs and parsley. Bake for 30-40 mins until the top is golden.