Sift 225g plain flour into a large bowl, add 100g diced butter and rub in with your fingertips until the mixture resembles fine breadcrumbs.
Stir in a pinch of salt, then add 2-3 tbsp water and mix to a firm dough.
Knead the dough briefly and gently on a floured surface.
Wrap in cling film and chill while preparing the filling.
To make more or less, remember the proportions - half fat to flour - and don't add too much water or the pastry will be hard. If other dry ingredients are included in the recipe, add them at the same time as the salt.
Recipe from Good Food Vegetarian Christmas, December 2006