Diamond Fruitcake

The world's most expensive dessert is a $1.65 million fruitcake, produced by a renowned Tokyo pastry chef. It was sold for Christmas 2015. It apparently took the chef six months to conceptualize the cake's creation, and another month to produce it. We know that the cake is adorned with 223 diamonds of various sizes. However, the rest remains a mystery, as the chef has steadfastly refused to disclose any of the other ingredients in his work.