Prepare the dressing by mixing the lemon juice and mayonnaise.
Season with salt and pepper to taste.
Optionally, add 1-2 teaspoons of vinegar.
Add freshly chopped dill and mix well.
Using the slicing attachment on your food processor or a knife, thinly slice the cucumbers, radishes, ...
...
and red onion.
Place the sliced vegetables in a mixing bowl.
Pour the prepared dressing over the sliced vegetables.
Mix until well combined.
Serve as a side with meat or fish, as an appetiser, or light dinner.
Eat immediately, or store in the fridge for up to 2 days.