Matsoni

Matzoon (Armenian: matsun) or matsoni (Georgian: mats'oni) is a fermented milk product of Armenian origin, found in Caucasian cuisine, particularly in Armenia and Georgia. It is very similar to yogurt. It is made with Lactobacillus delbrueckii subsp. bulgaricus and lactic acid bacteria.

Matzoon is made from cow's milk (mostly), goat's milk, sheep's milk, buffalo milk, or a mix of them and a culture from previous productions.

The name of the product originates from Armenian matz (sour, glue). The product is widely mentioned by medieval Armenian writers, e.g. Grigor Magistros (11th century), Hovhannes Erznkatsi (13th century), Grigor Tatevatsi (14th century) and others. Grigor Magistros, in his Definition of Grammar, gave the correct etymology of the word.

...
Wikipedia