Remove approx. 150 ml from a bottle of schnapps, then add the sugar, vanilla sugar and approx. 120 coffee beans (ungrounded - about a double shot glass is full) to the bottle.
Screw the cap back on and shake vigorously once a day. When all the beans have sunk to the bottom (after approx. 10 days, but you can stay in there longer) filter through a sieve with kitchen paper and add the cream. Mix with a hand blender for a few minutes.
Enjoy well chilled. Since the cream always settles a little after a while, just shake it.
I usually make 5 bottles at the same time, for this I fill the excess of 4 bottles into a 5th, then I either have a supply and / or something to give away. I only add the cream when it`s ready to be drunk.