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Tip the chorizo into a frying pan and cook over a medium heat until it releases its oil and becomes crisp in places. Meanwhile, make the aïoli: stir together the ingredients with some seasoning, then chill.
Put the chorizo and its oil in a food processor and pulse until broken into small chunks. Add the breadcrumbs, almonds, lemon zest, seasoning and half the olive oil, then blitz to a crumb.
Heat oven to 200C/180C fan/gas 6. Put the cod fillets on a lightly greased baking tray, then brush with the remaining oil. Heap the crumbs onto the fish and pat down so that the fillets are well covered. Let them firm up in the fridge for at least 20 mins.
When you’re ready to cook, pop the fish in the oven for 10-15 mins, depending on the thickness of your fillets, until the flesh has turned opaque and the chorizo crumb is golden.