Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Preheat the oven to 170C/fan 150C/gas 5.
step 2
Blend the butter and flour in a food processor until it looks like fine crumbs. Stir in the sugar and egg yolk. Pulse until the dough clumps together. Wrap in clingfilm and chill for 30 mins or until firm.