The name means 'flame cake' because it was originally slid into a wood-fired oven just to test whether the fire was hot enough to bake bread — a byproduct of baking day, not a dish in its own right.
A paper-thin dough is spread with crème fraîche, then scattered with onion and bacon lardons and baked briefly at very high heat until the edges char and blister. Pfalz wine-village stands and street festivals cut it into strips and sell it by the piece.