Wikipedia
Rönttönen
A Rönttönen is a traditional sweet Finnish delicacy from Kainuu.
A small (about the size of the palm of a hand) open faced pie consisting of a crust made of barley or rye dough, filled with a sweetened mashed potato and berry (most often Lingonberry) filling.
Typically, it is served as an accompaniment to a coffee.
The Kainuun rönttönen has a protected geographical indication under the EU law.