Sour Cream Cucumbers

1/2 C sour cream
3 T white vinegar
1 T sugar
Pepper to taste
4 medium cucumbers, peeled if desired and thinly sliced
1 small sweet onion, thinly sliced and separated into rings

In a large bowl, whisk sour cream, vinegar, sugar, and pepper until blended. Add cucumbers and onion; toss to coat. Refrigerate, covered, at least 4 hours. Serve with a slotted spoon.