We're reaching the end of cherry season (it's just sour cherries now) and we needed to get some in jars for the rest of the year.
I started from 3kg of cherries (with pits). Andrea pitted them and I did one smaller batch (maybe 300g of cherries) in the armagnac/syrup left from an earlier batch of sweet cherries in armagnac. The remaining cherries went in a pot with a bit of water and 1 kg of gelierzucker. After this boiled it went into clean jars.
We probably need to do some more to last the year, but this is at least a good start.