carta da musica
'music paper' bread
Carta di musica is a traditional Sard unleavened bread, that comes in paper thin round sheets. Also known as pane carasau or pane guttiau, it's made by baking flat bread, splitting it horizontally into slices, and baked again until crisp.
Made for shepherds, who would be away from home for months at a time (if kept dry, it is said to last a year). No one knows how old it is, although archaeologists have found signs of the bread in the island's ancient nuraghe, going back 3000 years at least.