Lemon and Blackberry Karpatka

It’s natural to think of karpatka as a winter cake, what with the snow-capped mountain look and all. While the basic version is made with a vanilla mousseline filling, as in the previous recipe, in a country ever seeking ways to use up an abundance of summer fruits, among other ingredients, karpatkas take on many twists. There are pistachio karpatkas, blueberry karpatkas, chocolate karpatkas—endless karpatkas, really. This karpatka uses lemony cream and blackberries, a favorite in the Polis