Matsoni

Matzoon[a] or matsoni[b] (Georgian: მაწონი, mats'oni) is a fermented milk product of Armenian origin found in Armenia and Georgia. The Caspian Sea yogurt commercialized in Japan is said to be the same type of yogurt as matzoon, but a comparison of microbiota and viscosity found that the two are entirely different. Georgian Matsoni has been a protected geographical indication in Georgia since 24 January 2012. The name of the product originates from Armenian matz (sour, glue). The etymology is provided by Grigor Magistros, in his Definition of grammar (11th century).

Source: Wikipedia