It's called Jälkiuunileipä. There is actually some information in English about it in Wikipedia: > The old tradition was that all bread in the house for the y

It's called Jälkiuunileipä. There is actually some information in English about it in Wikipedia: > The old tradition was that all bread in the house for the year was baked in a few days, in a large oven that took a long time to cool after being fired. Thus, jälkiuunileipä (lit. after-oven bread) could still be baked in the residual heat. The longer baking time in the lower temperature gives it a darker color, higher density and hardness than regular rye bread, comparable to a fruit cake. In addition to the traditional reikäleipä shape, there are also rectangular ruispala-type pieces available. https://en.wikipedia.org/wiki/Finnish_bread https://en.wikipedia.org/wiki/Finnish_bread