My old high school friend, Helen, turned 50 this year (2007) and had her party at The Gap Tavern in Brisbane. They served this cake and Mother Kooka said, "That's all I want for my birthday! I want you to make me that cake!" Well! I had no idea what it was, but I googled and found some possibilities and then cobbled together this recipe. We had it yesterday for Mother Kooka's 83rd birthday party and it was an absolute hit! In fact, one guest said, "I am not going home until you give me the recipe!" I promised I'd post it on Zaar so that everyone could enjoy it - so here it is! Important: make it the afternoon before you want it, as it needs to sit in the oven overnight. (Oh, by the way, I've said it will serve 10, but we had nearly 20 at the party and I served everybody by cutting very thin slices. It's quite rich, so nobody felt deprived).