This recent New York Times travel article by Tony Perrottet documents a modern man's hunt through Paris as he tries to follow in the footsteps of Alexandre-Balthazar-Laurent Grimrod de la Reynière. Grimrod was a 19th century aristocrat famous in food history circles for his Almanachs des Gourmands: culinary guides to the city of light that reveal meals of Paris past.
Perrotet managed to reach Stohrer, a bakery and culinary destination still in business long after Grimrod's time.
Next time I'm in Paris, I'm going to Stohrer and ordering Le Baba Au Rhum, in honor of an old language teacher from the South of France who once described this to me as her favorite French dessert. (While I may not always remember every conjugation, I can usually tell you the favorite dessert of my French teachers.)