Japonaise? No, not Japanese mayonnaise lol. This is a wonderful cake made of discs of almond meringue sandwiched together with a coffee-flavored butter cream. It was popular when I was a child growing up in Australia and, happily, I recently discovered this recipe which originally appeared in a Vogue Entertaining magazine. It is not at all difficult, and is best made a day in advance and refrigerated until just before serving. Very rich!!