Okroshka is one of the few soups Russians eat cold — built on fermented kvass instead of broth, it was originally a way to stretch a few scraps of meat into a whole meal.
Okroshka is a cold soup of diced boiled potatoes, eggs, cucumber, radish, and bits of meat or sausage, all suspended in tangy kvass or soured kefir instead of hot stock. In summer, market cafés and food stalls around Moscow ladle it into cups for a quick, cooling lunch.