01 -
Use a sharp knife or mandoline to slice the cucumbers as thinly as possible. If using onions, slice them thinly as well.
02 -
In a mixing bowl, whisk together the vinegar, sugar, salt, and pepper until the sugar is dissolved. If making a creamy version, add the sour cream and whisk until smooth.
03 -
Add the sliced cucumbers (and onions if using) to the bowl with the dressing. Toss to coat evenly.
04 -
Sprinkle in the chopped dill and give the salad another toss to distribute the herbs.
05 -
Refrigerate the salad for at least 30 minutes to allow the flavors to meld. Serve cold.