Taking advice from the experts we added 3 pots of Mesimestari honey to our own, to trigger the crystallization process. The barrels of honey are in the cool cellar (under the sauna) and we are stirring twice a day.
Within a few hours of adding the "bought" honey, we noticed a significant change in the aspect of ours: it had changed colour and consistency. Apparently the bought honey acts as a "starter" (a bit like live yoghurt or sourdough) but to be honest I'm not sure I understand the science behind it yet.
We will continue to stir the honey for 2-3 days and then we will be ready to put it into pots.
One thing is sure... it tastes really good!
(I'll add some photos but I have a new camera and no clue how to use it yet)