Sorrel soup is a soup made from water or broth, sorrel leaves, and salt. Other possible ingredients are egg yolks or whole eggs (hard boiled or scrambled), potatoes, carrots, parsley root, and rice. It can be served hot or cold, and is usually garnished with sour cream. It is known in Russian, Polish, Ukrainian, Lithuanian, Latvian, and Eastern European Jewish cuisines. Its other English names, spelled variously schavel, shchav, shav, or shtshav, are from the Proto-Slavic ščаvь for sorrel. Due to its commonness as a soup in Eastern European cuisines, it is often called "green borscht", as a cousin of the standard, reddish-purple borscht soup.