Peel, core and roughly dice the cucumber. Pluck the dill from the stalks. Puree the dill, lemon juice, sugar, buttermilk and cream in a blender. Season to taste with salt and pepper. The mass can still be a little grainy, so you have an intense cucumber taste.
Let the gelatin soak in 6 tablespoons of water for 10 minutes. Warm the wormwood and stir quickly into the swollen gelatin. Then pull the gelatine / wormwood mixture into the cucumber mixture and stir well.
Pour the mixture into molds previously rinsed with cold water (I use coffee cups or mocha cups, the amount makes about 8 mocha cups or 4 coffee cups) and leave to cool in the refrigerator overnight.
The next day, turn the mousse onto a plate and serve with salmon tartar (my profile) or trout caviar as a starter.