Shchi () is a Russian soup with cabbage as the primary ingredient. When sauerkraut is used instead, the soup is called sour shchi, and soups based on sorrel, spinach, nettle, and similar plants are called green shchi (, zelyoniye shchi) or schav (Yiddish shtshav, from Polish szczaw). In the past, the term sour shchi was also used to refer to a drink, a variation of kvass, which was unrelated to the soup. History Shchi is a traditional soup of Russia where it has been known as far back as the 9th century, soon after cabbage was introduced from Byzantium. Its popularity in Russia originat...