A Rönttönen is a traditional sweet Finland, Finnish delicacy from the region of 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.
'Rönttönen sai EU:n nimisuojan'
'(In Finnish) Helsingin Sanomat, 4.Nov.2008 Typically, it is served as an accompaniment to a coffee. The ''Kainuun rönttönen'' has a Geographical indications and traditional specialities in the European Union, protected geographical indication under the European Union, EU law.Kainuun rönttönen Profile
European Commission

References

Finnish cuisine Fruit pies Finnish products with protected designation of origin {{finland-stub