Make the pastry by blitzing the flour, butter and a pinch of salt together in a food processor until it resembles fine breadcrumbs. Pulse in the egg yolk until a soft dough forms (you may need to add ½ tsp or so of water but do this very slowly and gradually). Tip the mixture out and form into a flat disc before chilling for 15-20 mins. Roll out the pastry on a lightly floured surface until ½cm thick and wide enough to line a 23cm tart tin (loose-bottomed is easiest). Prick the base all over with a fork and chill for 15 mins.
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