1. Preheat the oven to 180°C. Sift the flour onto a clean, dry work surface, then make a well in the flour and add the caster sugar, pushing it to the sides of the well.
2. Add the chopped butter, vanilla seeds and the egg yolks to the middle of the well and, using your fingertips, gently bring the mixture together to form a smooth dough. Knead until just combined, then wrap in clingwrap and chill for 30 minutes.
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