While I have not yet had the pleasure of visiting CDG or BRU (which just means I have that to look forward to!), I can recommend an incredibly rich chocolate dessert at a restaurant. It's a soutnerh/southeastern chain called Don Pablos - mexican texan type food, you know, fajitas and such.

They have a dessert called the chocolate volcano.

Their description: "Nothing can save you from the enticing richness of the chocolate cinnamon cake surrounded by a pool of molten, chocolate butter sauce, topped with premium vanilla bean ice cream"

My description: "orgasm on a plate"

The cinnamon cake and vanilla ice cream cut the sheer richness of the chocolate sauce so that you can stand the intensity of it. Such a wondrous combination. I drool even thinking of it.

It may not be as highbrow as many of those mentioned here, but it is an incredible experience