01 - In a large bowl, combine the thinly sliced cucumbers, red onion, and chopped dill.
02 - In a separate small bowl, whisk together the sour cream (or Greek yogurt), vinegar (or lemon juice), sugar, salt, and black pepper until smooth.
03 - Pour the dressing over the cucumber mixture and toss gently until well combined. Chill in the refrigerator for at least 30 minutes before serving for best flavor.