Crust-
2 1/2 cups of regular flour
1 tablespoons of sugar
3/4 teaspoons of salt
1 cup of unsalted butter, chilled and cut into small cubes
5 tablespoons (and possibly more) of water, chilled
In a large bow, sift together the dry ingredients. Add the butter, and begin to rub in between fingers, until the two come together and resemble crumbs (this takes a bit of time and effort but don't give up!).
Add the water, little by little, and knead a little to make the dough form properly (ie. uniform colour, no lumps etc.)
Gather the dough together and divide into 2 balls, then flatten into discs, wrap in plastic-wrap and pop them in the fridge for at least 30 minutes. Note that dough can be made two days in advance and stored this way.
When ready to assemble the pie, leave the dough for 5 minutes to soften slightly (but not too much because that makes it harder) and roll out one disc with a pin and place in a 30cm pie dish (preferably glass).
Filling-
Peel the apples and slice them into roughly .5cm to 1cm pieces.
Place the apples into a large bowl, then add lemon zest, and around half the lemon juice depending on the variety of apple you choose.
Add all of the remaining dry ingredients and fill your tart shell.
Roll out the other pastry disc and cut 1.5cm wide strips that cover the length of your pie.
Place the strips vertically in one direction and then turn you pie to be horizontal and lay vertical strips again.
Coat the top with the egg white, then bake uncovered for 25 minutes at around 210°C.
When the top is well browned, cover and cook at 180°C for a further 30 minutes or so.