Flaky, sweet chocolate pastry for pies and tarts.
In a large bowl, rub the margarine into the flour. Stir in the cocoa powder and icing sugar.
Use your hands to press it together into a ball of dough. If the dough is too sticky, add more flour and if it's too dry, add a small amount of ice cold water to help it come together.
Wrap the dough and chill for 30 minutes.
Preheat your oven to 200°C (180°C fan).
Roll the chilled dough out on a floured surface to around ¼ cm thick. Drape it over a 9-inch tart tin and press into place.
Dock the dough with a fork.
Place baking paper over the bottom of the tart and cover with baking beans, dried lentils or uncooked rice.
Blind bake the pastry for 15 minutes. Remove the baking paper and beans then bake for a further 15 minutes.
Leave to cool completely before removing it from the tin.