Onion Tart

For the Shortcrust Pastry

• 250 g (9 oz) plain flour, plus extra for dusting
• 1 teaspoon

For the pastry, sift the flour and salt into a bowl. Add 1 egg yolk and the butter and work to form a rough dough. If using a food mixer, use the beater at slow speed until the ingredients are just amalgamated. Add 4 tablespoons of cold water and knead gently to make a smooth dough. Roll into a ball