1.
Put the flour into a bowl, add the butter and rub in with your fingertips
until the mixture resembles fine breadcrumbs. You can also do this
in the food processor.
2.
Stir in the icing sugar. Add the egg yolk and 2 egg shells full
of very cold water. Stir with a knife, then use your hands to bring
the dough together in a ball.
3.
Knead lightly, wrap in cling film and refrigerate for 30 minutes. |