If you do not have a Food processor this is how to do this by hand.
Weigh accurately all Pastry Ingredients. (make sure the butter is cold).
In a large bowl, add the Flour, Salt and Sugar with a whisk and give a quick mix so the ingredients are evenly blended.
Add the cubes of cold butter with your hands, and rub the flour, sugar, and butter together until the mix resembles fine breadcrumbs.
Mix the egg and egg yolk; a quick whisk will do.
Add the egg mix to the pastry crumb mix, combine, and gently knead until you have a smooth, pliable dough.
The Pastry dough needs to rest and firm up to do this; Wrap in cling wrap or baking paper and refrigerate for at least 30 minutes.