The Salon Professionnel du Chocolat's Fujisan is a candle made of chocolate. As it burns down, it oozes molten chocolate onto the cake in which it is mounted. I imagine this would require a lot of patience on the part of the dessert-eater, but it might make a cool centerpiece that the host lights up just before clearing the main course plates.
FUJISAN plays with 2 inescapable elements of birthdays: the candle and the chocolate cake. The idea is to revisit the "fondant au chocolat" by using the candle to obtain the warm heart of the cake. Planted in the biscuit, the chocolate candle melts little by little it and fills the "crater" of the cake. So, the time of a song, the fondant gets ready under our eyes.