The bûche de noel, a staple item in window displays all over the city, all decorated differently and in different flavors.
It wasn't just sweets that were on display - many stores were selling prepared foods, including stuffed lobsters, foie gras, and escargots...
I've been curious about marrons glacés for a long time, and got to try one from Fauchon. This one was "nature" i.e., not flavored with anything - and it was cultivated in France (yes, I got to choose the "terroir" of this candied chestnut)
It was kind of tasty on its own, but, having purchased two, I ate the second one with some thick yogurt, and enjoyed its nutty sweetness more that way.