I don't know about this but my wife and I make the most amazing Wiśniówka Wódka
Here's what you need...
For 500ml of spirytus You need:
1 kg cherries
250 grams sugar
piece of cinnamon (not powder)
half stick of vanilla
5 clove seeds
and 5 cardamom seeds.
...and here's what to do...
Firstly you need to wash and remove the stones from the cherries. Put the cherries into a bottle, add sugar & spices then cover with spirytus. stick a rubber bung into the bottle and stir.....(rotate bottle so liquid swirls round bottle).... Store in a cool place out of the light and you must stir once per week for at least six months. That is you pick up the bottle and make a circular motion with it. Then invite friends round to sample.
The spyritus needs to cover the cherries and it helps flavour if you leave the stones in half a dozen cherries.
Also once you have drunk the Vodka the cherries can be used for cooking.