Squeeze fresh sausage out of the skin in small pieces / balls (preferably with the back of the knife) and fry in plenty of oil in a saucepan.
Take the sausages out of the pot.
Peel the cucumber and cut in half lengthways. Scrape out the seeds with a spoon and cut the cucumber into slices as thick as a thumb. Fry these in the same saucepan and season with salt and pepper.
After a few minutes, cover completely with water, stir in the vegetable stock and mustard and cook for about 10 minutes until the cucumbers have softened.
Add the sausages and crème fraiche and heat.
Just before serving, add fresh, finely chopped dill.