Barbagia and Nuoro province, Sardinia — the interior shepherd country. Pane carasau is documented from medieval sources as the shepherd's bread — made in batches large enough to last for weeks on the mountain pastures. The twice-baking process is what makes it uniquely shelf-stable.
Pane carasau (also called carta musica — music paper — for its translucent thinness) is the extraordinary twice-baked flatbread of Sardinia: a large, paper-thin disc of semolina dough, rolled ultra-thin, baked once until puffed (forming a hollow pillow), then split in half and returned to the oven until completely dry and crisp. The result is a brittle, translucent flatbread that keeps for weeks without losing its crispness — specifically designed for shepherds who needed shelf-stable bread during the weeks of transhumance in the Sardinian mountains. When soaked briefly in water or broth and layered with ragù and cheese, it becomes pane frattau — a complete dish from bread.
Pane carasau is not subtle — it is crisp, wheaty, and slightly salty, with the nutty sweetness of well-baked semolina. Drizzled with good Sardinian olive oil and flaked sea salt (pane guttiau), it is one of the best simple things to eat. Soaked in lamb broth for pane frattau, it transforms into something yielding and deeply savoury.
The dough: semolina rimacinata, water, and salt — thin enough to roll to 1-2mm. Roll into large discs (40-50cm) as evenly as possible. The first bake (a fornata): place in a very hot oven (280-300°C, wood-fired is traditional) for 2-3 minutes until the disc puffs into a balloon shape. Remove immediately. Split the puffed disc horizontally into two sheets (the puff creates a natural separation point). Return both sheets to the oven for a further 4-5 minutes until completely dry, crisp, and pale golden. Cool on racks. The bread is ready when it snaps cleanly.
The puffing in the first bake occurs because the oven heat converts the water in the thin dough to steam instantly, inflating the disc. The even rolling is therefore critical — thin spots puff; thick spots don't. A pasta machine rolled to its thinnest setting is the domestic approximation. Pane carasau is used as a base for pane frattau: dip briefly in hot salted water or lamb broth, layer with tomato sauce, Pecorino Sardo, and a poached egg. This is a complete meal from pantry staples.
Not rolling thin enough — insufficient thinness prevents the puffing in the first bake. Opening the oven too early during the first bake — the disc must puff before removal; opening prematurely releases the steam. Not completing the drying phase — pane carasau that is not completely dry (it should snap, not bend) will not keep. Splitting the puffed disc when it is cool — split immediately while hot; once cool, the two layers separate with difficulty.
Carol Field, The Italian Baker; Slow Food Editore, Sardegna in Cucina