The classic soup is a mix of mostly raw vegetables (like cucumbers and spring onions), boiled potatoes, eggs, and a cooked meat such as beef, veal, sausages, or ham with kvass. Kvass is a mildly alcoholic beverage made from fermented black or rye bread. Okroshka is usually served with sour cream. Later versions use light or diluted kefir, vinegar, mineral water, or even beer instead of kvass.