This treat is found in pretty much all Australian bakeries and is derived from a French pastry called Mille-feuille, here's the wiki on it: http://en.wikipedia.org/wiki/Mille-feuille. The Australian version is topped with either passionfruit icing or icing sugar.
So, I looked around and finally found a recipe that didn't use custard powder, as one, I don't have any and two, I prefer to make custard from scratch because it's really easy. Also, with this recipe, I didn't make the passionfruit icing because they are just about impossible to get in NE Ohio and I don't have any tinned pulp either...which reminds me, I have to go to the local Latin store and see if they have any.
If you've got a recipe you'd like me to try, just let me know and I'll have a bash at it.