Using cornflour/starch, flour, icing/powdered sugar or 2 sheets of paper, roll out the pastry to 3mm (⅛") thick.
Grease the tart tins well (see below for recommendation).
Cut out pastry circles, bigger than the tart tin diameter and centre in the tart tins, and then fit in to and up the sides of the tin.
Cut off the excess pastry by running a rolling pin over the edges. 'Dock' the pastry by making holes in the base of the pastry with a fork.
Line the pastry cases with foil and make sure the edges are covered, before filling to the top with baking beans or dried beans.
Place in the fridge for 30 minutes to chill and relax the dough. Pre-heat the oven to 190°c/170°c Fan Oven/375°f/Gas Mark 5.
Bake the pastries like this with no filling (called ‘blind baking’ or ‘par/part baking’, for 15 minutes.
Very carefully fold over the foil and remove foil and beans. Reduce the oven temperature to 170°c/150°c Fan Oven/350°f/Gas Mark 4.
Apply egg wash (1 egg & splash of milk) to the pastry and bake for about 5-10 minutes until golden and set all the way through.
Leave on the baking sheet/tray, on top of a cooling rack for about 10 minutes before removing the tray/sheet. Then leave to cool down completely before removing the cases. The filling should not be added until the pastries are cooled.