Ash
Ash-e doogh is a yogurt soup found in various parts of Iran, Azerbaijan and Shiraz, with differing but similar ingredients. It is a kind of Aush. Similar dishes are found all over West Asia. See Aush§Etymology The spelling of the name of this dish varies in English and can include ash-e dugh. There are some alternative terms for this soup, including ash-e mast. Doogh in ash-e doogh means "yogurt", while ash-e is a form meaning "A(u)sh of", meaning A(u)sh (made) of/from yogurt.
Source: Wikipedia