600g plain flour
200g sugar
150g toasted ground hazelnuts
450g unsalted butter, chilled and diced
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1 Place all the ingredients in a chilled food processor bowl and process until it all just comes together. (Overprocessing will make the mix oily.) Tip out onto a clean work surface and quickly, using the heel of your hand, make sure that all the ingredients are well mixed. Pat it into a round, wrap tightly in clingfilm and refrigerate for at least one hour.
2 Roll the dough to about 1cm thick. Work into a round shape and cut into pie-shaped wedges, or a rectangle and cut into oblongs. Transfer to a baking sheet lined with greaseproof paper and chill again for at least 30 minutes.
3 Preheat the oven to 150C/Gas 2. Cook the shortbread for 25-30 minutes. Ideally it should take little or no colour. Allow to cool and set slightly before removing to a wire rack to finish cooling. Store in an airtight container.