Method:
1 Combine eggs and ½ cup cream in a bowl.  Add fruit cake and soak for 2 minutes. 
2 Melt butter in a frying pan over medium heat, cook fruit cake for 2 minutes on each side or until golden.
2 Combine remaining 1 cup of cream and vanilla paste in a saucepan and bring to the boil over a medium heat, remove from heat.
3 Whisk egg yolks and caster sugar in a medium bowl, gradually whisk in the hot cream mixture. Pour mixture back into the same saucepan and stir over a low heat until mixture coats the back of a spoon.
4 Stack cake slices on a plate and dust with cinnamon sugar, spoon over custard and serve with ice cream.