1medium-size red onionhalved and very thinly sliced
½cupcrumbled fetaor goat cheese, optional
Mix together the sour cream, lemon juice, lemon zest, dill, chives, salt and pepper in a serving bowl. Add the cucumbers and onion, and toss well to coat evenly with the dressing. Cover and refrigerate for 1 to 5 hours.
Distribute the feta or goat cheese over, if using, and toss again. Serve.