01 - Place the thinly sliced cucumbers, red onion, and chopped fresh dill in a large mixing bowl.
02 - In a separate small bowl, whisk together the sour cream or Greek yogurt, white wine vinegar or lemon juice, sugar, salt, and black pepper until fully incorporated and smooth.
03 - Pour the prepared dressing over the cucumber mixture. Gently toss until all vegetables are evenly coated.
04 - Refrigerate the salad for at least 30 minutes to allow flavors to meld. Serve chilled.