boúza

A thick, sweet drink made from slightly fermented millet (kechri), popular in the Ottoman empire–(the name comes from the Persian)–bouza or boza was the first soft drink of the Balkans.

In the old days, it was sold by a bozatzis, who carried it in stamna (a clay vessel that kept the liquid cold) strapped to his back. There are bars, especially in northern Greece, that still serve, sprinkled with cinnamon.