01 -
Using a food processor, blend the flour, salt, and sugar quickly. Toss in butter and pulse until crumbly. Add in the vinegar and a little ice water, pulsing until the dough sticks together. If needed, sprinkle in more water.
02 -
Take the dough out of the processor, shape it into two balls with your hands, dust each with some flour, and wrap them tightly in cling film. Refrigerate for half an hour.
03 -
Flatten the two dough balls with a rolling pin. Line a 23 cm pie dish with one rolled-out crust, then cut a slit in the center of the second rolled-out crust.
04 -
Set the rack to the lower part of the oven. Preheat to 180°C.
05 -
Spread the blueberries evenly in the pie shell, sprinkle with sugar and tapioca, and cover it with the second crust.
06 -
Firmly pinch the edges together using a fork or your fingers. Brush the top crust lightly with milk.
07 -
Pop it into the oven for around 50 minutes. Let it cool a bit before you enjoy it.