METHOD
Beat the Butter and Sugar till pale.Add in the oil, Samolina and vanilla extract. Beat until light, white and fluffy.With a large spoon, mix in the flour and corn starch to form a soft but not a sticky dough. You shouldnt have cracks when rolling the dough.If cracks appear, add a little melted butter and mix in well..Take about a tablespoon of the dough, roll into balls.Place on a lined baking tray, spaced about about 2cm apart.Press the biscuits with a fork on top.Bake at 160c for 20 to 25 minutes until the bottom just starts to look pinkish.Do not brown.Remove from the oven.While still warm enough to handle dip each into castor sugar.Cool down completely then store in an airtight container.