Sorrel soup usually includes further ingredients such as egg yolks or whole eggs (hard-boiled or scrambled), potatoes, carrots, parsley root, and rice.[1][3][12] A variety of Ukrainian green borscht also includes beetroot.[11] In Polish, Ukrainian, Belarusian, and Russian cuisines, sorrel soup may be prepared using any kind of broth instead of water.[1][3] It is usually garnished with smetana, an Eastern European variety of sour cream.[1][3] It may be served either hot or chilled.
Sorrel soup is characterized by its sour taste due to oxalic acid (called "sorrel acid" in Slavic languages) present in sorrel. The "sorrel-sour" taste may disappear when sour cream is added, as the oxalic acid reacts with calcium and casein. Some may refer to sorrel flavor as "tannic," as with spinach or walnuts.
Green borscht with egg and sour cream
Green borscht made with spinach instead of sorrel and with potatoes
Ukrainian green borscht including both sorrel and beetroot
^ abcdefgBurlakoff, Nikolai (2013). The World of Russian Borsch: Explorations of Memory, People, History, Cookbooks & Recipes. North Charleston, SC: Createspace Independent Pub. ISBN978-1484027400.
^ abcЕкатерина Авдеева. Ручная книга русской опытной хозяйки. СПб, 1842 [Yekaterina Avdeeva. A Handbook of the Russian experienced housewife. St. Petersburg, 1842]
^ abcdefgЕлена Молоховец. Подарок молодым хозяйкам. 1-е издание, 1861, с. 65 [Elena Molokhovets. A Gift to Young Housewives. First Russian edition, 1861, p. 65]
^ abOchorowicz-Monatowa, Maria (1913). Uniwersalna książka kucharska z ilustracyami i kolorowemi tablicami odznaczona na wystawie hygienicznej w Warszawie w 1910 r. : przeszło 2200 skromnych i wytwornych przepisów gospodarskich i kuchennych z uwzględnieniem niezbędnych warunków odpowiedniej dyety codziennej hygieny oraz kuchni jarskiej (in Polish). Warszawa / Lwów: E. Wende i S-ka.
^ abcArtyukh, Lidiya (1977). Ukrayinska narodna kulinariya (Українська народна кулинарія) [Ukrainian folk cuisine] (in Ukrainian). Kyiv: Naukova dumka. p. 55.