I read on some other blogs that the 13 minutes the recipe says you should make them for is too long - they don't come out with liquid centers. For fear of under-baking mine, I baked them for 12 and a half minutes. They could have been baked for less time, but the centers were gooey, and the cakes delicious. I didn't sprinkle the finely chopped chocolate on top before baking, but I don't think they need it. They were very rich, and wonderful warm. But, I agree with what Dorie says - you have to eat them with something that balances the richness. Hence the vanilla ice cream.
If you need a quick dessert, then make these. I loved them, and hopefully you will too! If you want the recipe, you can find it in the book (link above) or here. Enjoy!