1) Preheat oven to 180C/Gas 4.
2) In a large bowl, mix all the ingredients together except for the icing sugar. Roll the dough into 2 1/2cm balls and place on a cookie sheet. Press down with a knife to make slits like a triangle in the cookie. Using the end of the knife, press the centre of the cookie downward. Bake for 8 to 10 mins. Let cool and then dust with icing sugar.