Its low alcohol content (usually under 1%) let it survive Ottoman-era religious restrictions on drinking, since it was considered a food rather than a proper alcoholic beverage.
A thick, faintly tangy drink fermented from millet or wheat, boza is served ice-cold in winter, topped with cinnamon and a handful of roasted chickpeas (leblebi) on the side. Vendors still walk Istanbul's streets after dark in winter, calling out for customers the way they have for over a century.