Solyanka Cafe, 24 Prospect Mira, ☎ +7-4012-936-203. Try the solyanka, a a thick, piquant soup that is either meat-based, fish-based or vegetable-based. It is cooked with preserved cucumbers, olives, capers and tomato puree that give a strong sour-salty taste to the the soup. Solyanka is perhaps one of the most popular soups besides borscht (beetroot soup) in Russia, but remains unknown beyond the national boundaries. 500 rubles.