Press the crumbled fruit cake in your hand and shape into balls. Refrigerating these balls overnight or for about 4 to 5 hours at least makes them easier to coat in chocolate.
Put the chopped chocolate and oil in a bowl and melt it over a pan of simmering water making sure the bottom of the bowl doesn’t touch the water.
Let the chocolate cool just a little. Then dip each ball in the warm chocolate so it is completely coated. Let the excess chocolate drip and place on parchment lined tray to set. Pipe any remaining chocolate over the set truffles to decorate. Else decorate as you wish.