Peel the cucumber and thinly slice or slice it. Salt lightly, knead and let steep for about 15 minutes. Pour off the resulting liquid.
Finely dice the red onion and add to the cucumber with the raspberry vinegar and cream. Season to taste with a little ground pepper, sugar and, if necessary, a little salt.
Finely chop the dill and add to the remaining ingredients. Mix in well and leave to stand in the refrigerator for about 30 minutes.