250g plain flour
½ teaspoon salt
125g butter
½ teaspoon baking powder
1 egg yolk, lightly whisked
2 teaspoons lemon juice
2 tablespoons cold water
Place the flour, salt, baking powder and butter in a food processor and process until the mixture resembles breadcrumbs. Turn out into a bowl and with a metal spoon mix in the egg yolk, lemon juice and enough water to form a soft dough. Wrap the dough in cling film and place in fridge for at least 1 hour before rolling out.
Roll out on a lightly floured surface to approximately 3mm thick. Cut out 6 circles using a saucer as a guide.