📷 Closely related photo — Photo: Arnaud 25 / Wikimedia Commons · CC BY-SA 4.0
Chestnuts were so central to the old Corsican diet that the chestnut tree was known on the island as the 'bread tree,' and Pietra puts that flour straight into the brew.
Pietra is an amber lager brewed near Bastia since 1996, made with a portion of Corsican chestnut flour alongside barley malt. It pours copper-colored with a malty, faintly nutty, toasted sweetness that sets it apart from standard European lagers.
Why it's made this way: Chestnuts were long a staple crop and even a currency of rural Corsica, and the Sialelli family's Pietra brewery, built near Bastia, turned that island-specific ingredient into a beer that's now inseparable from Corsican identity.