Mix the pitted sour cherries with the preserving sugar.
Remove the seeds from the chilli and cut into very small cubes, add to the cherries.
Chop the couverture into large pieces.
Now the sour cherry mixture for 5min. Cook. Then take the pot off the stove and let it cool down a bit, otherwise the chocolate will melt too much. Only when the jam has cooled down a little, carefully fold in the couverture and then immediately pour into prepared twist-off glasses.