Preheat fan oven to 180 degrees C
Put the flour, lard and sugar in a mixing bowl and rub in the fat until there are no large lumps
Mix in the currants, then the milk and stir until you can combine the mixture into a dough
Line baking tray approximately 30cm by 20cm and press in the dough
Brush a little milk over the top and lightly mark out vertical and horizontal lines to mark cake squares
Bake for 40 minutes, turning after 20 minutes to ensure an even bake
Dust with sugar and leave to cool
