(Egyptian) zythos (Greek: ζῦθος, Hebrew: sisni (mnemonic)), Latinised as zythum), is a type of beverage used as both a recreational alcoholic beverage and as a medicine. The word zythos is the Greek version of an Egyptian word for beer.[1] The recipe is mentioned in the third tractate of the Babylonian Talmud (42b).[2]
According to Rav Yosef b. Hiyya, it contains 1⁄3 barley, 1⁄3 safflower seed and 1⁄3 salt. Rav Papa substituted wheat for barley. The ingredients are steeped, roasted and ground before drinking.
Drinking zythos is dangerous for sick people and for pregnant women. It works as both a laxative and an antidiarrhoeal.
It is forbidden during Passover because it contains barley, thus making it chametz, although the punishment of kareth is not applicable to its consumption.