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Heat oven to 190C/170C fan/gas 5. In a food processor, whizz together the flour, icing sugar and butter until they form fine crumbs (or rub in with your fingers). With the blades running, add the zest, then 3 tbsp orange juice. Process for a few secs until the mixture forms clumps. If you need to, add a few extra tsps orange juice to bring the pastry together.
Tip onto a very lightly floured surface, knead briefly until smooth, then chill in the fridge for 30 mins or until firm. The pastry can be made up to 3 days ahead or frozen for up to 1 month.
Lightly dust the work surface with flour, then roll out the pastry to approx £1 coin thickness. Cut out 12 x 8cm rounds with a fluted cutter and press into a 12-hole non-stick bun tin. Re-roll the trimmings to the same thickness and stamp out 12 x 5cm rounds for the tops. Spoon about 1 tbsp mincemeat into each base and press on the tops.
Brush the tops with the egg, then bake for 15-20 mins until golden and crisp. Cool for a few mins, then lever out of the tins with a table knife and cool on a wire rack. Store in an airtight container for up to 1 week. Warm gently to serve, dusted with sifted icing sugar, if you like.
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