Sieve the plain flour. Cube the butter.
- 1 In a large bowl, rub the butter into the flour using the tips of your fingers until it resembles fine breadcrumbs.
- 2 Sieve in the icing sugar, stir to combine, then add the egg yolk and sprinkle over the water.
- 3 Bring the mixture together with your hands, kneading a couple of times to form a soft dough.
- 4 Wrap in cling-film and put in the fridge to rest for 30 minutes.