In a mixing bowl, mix in the flour, salt, icing sugar and butter using your fingers until light and crumbly. The icing sugar will prevent the dough from cracking
Add the water then knead to form a dough ball
Leave it to rest for 30 minutes in the fridge
Heat your oven to 180C
Flour your worktop, then roll your dough to form a large rectangle
Cut out circles with a 10cm/4in round cutter and use to line the tins, re-rolling the pastry as necessary
Bake for 20 minutes
For the lemon curd
In a bowl, mix in the eggs and the sugar, add the lemon and zest
Boil 15 cl of water in a pan, then add the cornstarch, making sure to constantly stir
Then pour in the lemony mixture. Cook for a couple of minutes while stirring
Then mix in the butter
For the meringue topping
Beat the egg white until they are soft and glossy
Add the icing sugar and beat until soft peaks form
Pour the lemon curd in the pie cases and top with the meringue