Lionel Gras and Judith Tulkens talk to us about the history of cakes, sweets and pastries. For instance, how did layers come into existence? Which pies are the favourites of people on the street? Which pies are typically Belgian? Lionel and Judith then investigate the old saying "Daar zijn de daken met vlaaien bedekt" ('There, the rooftops are covered with pies'): which sort of pies are those?