250g flour, plus
extra for dusting
150g cold unsalted butter, cut into small cubes
75g caster sugar
zest of a lemon - optional
1 free-range egg, beaten
pinch of salt
1 or 2 tbsp milk or cream
Pulse the the flour, butter, sugar and salt (and
lemon zest, if using) together in a food
processor until the mix looks like breadcrumbs. (Life is too short to rub
this together by hand).
Remove to a large mixing bowl. Add the beaten egg slowly to form a dough.
Add a tablespoon or two of milk or cream if the mixture is too dry. Don't
overwork the dough.
Shape into a ball and flatten slightly into a disk, then
wrap tightly in cling film and refrigerate for 2 hours.