Place the flour and icing sugar in a food processor, and pulse briefly to mix.
Add the cold butter, roughly chopped, and pulse until the mixture resembles breadcrumbs.
Add the egg yolk, along with 1 tbsp of cold water. Pulse until the dough has almost come together.
Tip everything out and bring the pastry together by hand. Shape into a flat disc and wrap in cling film, then chill in the fridge for at least 30 minutes.
On a piece of baking parchment, roll out the pastry into a circle, slightly larger than the tart tin, and about 3mm thick. Lift up the baking parchment and invert over the tart tin. Peel back the baking parchment.
Carefully lift up the edges, and ease the pastry down into the tin.Push and press the pastry into every crease of the tin, leaving a small lip over the side of the tin.Patch areas where required, trying to keep the pastry the same thickness.
Move the tart tin to the fridge for 20 minutes, or to the freezer for 5 minutes.
Preheat the oven to 180c/160c fan
Use a paring knife to trim the pastry, flush against the top of the tart tin.
Prick the base of the tart shell with a fork, and then line the tart with ovenproof clingfilm or baking parchment, and fill with uncooked rice.
Bake the tart shell for 20 minutes, then lift out the rice parcel. Bake for another 10-12 minutes, until the pastry is completely cooked.
Leave the tart shell to cool completely and dry out. Remove from the tin, and place on the presentation plate.