Mishka na severe or Bear in the North started as an iconic Soviet candy from Leningrad, but over time it's been made into a cake inspired by the candy's flavors. Although there's no standard recipe, and every household had its own version, the cake's layers are usually made with a combination of flour, sugar, sour cream, butter, cocoa powder, baking soda, vanilla, and salt, while the creamy filling that goes between the layers is made with sour cream, powdered sugar, and walnuts or hazelnuts.