Its name means 'cake baked in the flames': it cooks in a minute or two at the front of a very hot wood oven, right beside the embers.
Flammekueche is a paper-thin rectangle of bread dough spread with fromage blanc or crème fraîche, then scattered with onions and lardons and baked hot and fast until the edges char. Market and festival stalls slice it into strips to eat by hand.