Place the cucumbers in a glass bowl. Sprinkle them with salt and vinegar. Cover and let stand for 30 minutes. You can also let them sit like this in the fridge overnight.
Pour off the excess liquid and drain in colander for about 30 minutes to allow complete drainage.
Add the mayonnaise, sour cream, dill and pepper, and mix well.
Cover and refrigerate until serving time.
This is the perfect side dish to serve with salmon, steak or grilled chicken.