Okroshka

This soup, one of the oldest types of cold soup in Russia, was made with sour white kvas, summer greens, and vegetables. During the Soviet period, people added potatoes and boiled sausages to okroshka. It was around the same time that a version of okroshka made with kefir and sparkling mineral water became widespread. While okroshka in the pre-revolutionary period did not feature potatoes, nowadays it does almost everywhere.