Okroshka is a traditional cold soup typically served in the warm months. While there are many different okroshka recipes, this soup is always based on kvass with added vegetables. Some recipes also call for meat, often bologna cut into cubes. Here we offer a meatless version, perhaps a bit less filling but more thirst quenching on a hot summer day. As it happens in many Russian soup recipes, okroshka is served with sour cream.