Which German cake is named for the wreath shape of the crown associated with Frankfurt?

Frankfurter Kranz is the German cake named for the wreath shape of the crown associated with Frankfurt.

The cake is a ring-shaped sponge or similar layered cake filled with buttercream and often covered with more buttercream. A coating of brittle, usually made from caramelized nuts, gives it a distinctive crunchy exterior. Red jam or jelly is commonly placed between layers, adding color and acidity to the rich filling.

Its wreath form is an allusion to Frankfurt’s historical importance as a coronation city of the Holy Roman Empire. The cake should not be confused with a simple Bundt cake: the central hole is part of its symbolic shape, while the buttercream and brittle are central to its traditional identity. Recipes vary in sponge and filling details, but the ring presentation remains characteristic.