>>510300219
18% cream. Natural yoghurt only if you have to cut calories and fats.
Onion should be there. Normal is fine, but shallot onion is better.
Ideally, also chopped chives or spring onions, besides just chopped dill.

Pepper, salt, maybe a tiny bit of sugar, depending on taste. A bit of lemon juice.
Sliced radish can be added to make it more interesting.