A well known bakery chain with multiple locations around Moscow (http://wolkonsky.com/en/russia/moscow/). The black currant pastry was something I read in a post that gave me some good ideas for Moscow eating (http://travelsort.com/blog/8-things-to-eat-in-moscow). Luckily for me one of the branches was right around the corner from my cosy accommodation Apple Hostel.
It gave me a good place to find my morning breakfast before the short walk to Red Square.