Peel the cucumbers if you want to. Slice in half lengthwise, then chop into ¼" slices.

Peel onion, slice very thinly. Chop slices into halves or quarters - you want ¼-1/3 cup of onion slices.

Place cucumber and onion slices in a large bowl. Add salt, toss to coat well. Let stand for 10 minutes.

While waiting, mix together sour cream, dill, mayo, vinegar, and sweetener. Season with salt and pepper, to taste.

Once the 10 minutes are up, dump cucumbers and onions out onto some paper towels. Pat dry with more paper towels.

Add cucumber and onion to a large mixing bowl. Pour dressing over cucumber mixture, toss gently to coat.

Taste, add more salt and/or pepper, if desired.

Chill until serving.