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First make the pastry. Put the flour, salt and ground cardamom seeds in a food processor and blitz to mix. With the machine running, gradually add the butter, piece by piece, and pulse for a few minutes until reduced to tiny lumps. Mix in the egg yolk. Tip the mix into a bowl and knead together for a few minutes to make a dough. Wrap in clingfilm and leave to rest in the fridge for an hour or so