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.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.