Or matzos. The French word comes from the ancient Greek ἄζυμος for without leaven. It’a available in boxes in every supermarché
Papier azyme or feuille d'azyme or papier hostie or papier ostie (literally ‘communion host paper’) is usually made out of potato flour and water. It lies underneath the nougat de Montélimar and calissons.
Image by Open Food Facts