- Wash the cucumbers thoroughly. Peel them in alternating strips, creating a striped pattern. Slice the cucumbers thinly (about ⅛-inch thick). 
- Place the cucumber slices in a colander set over a bowl. Sprinkle with the salt, toss gently to coat, and let sit for 30 minutes. After 30 minutes, gently press the cucumbers with paper towels to remove additional moisture. 
- While the cucumbers are draining, slice your red onion as thinly as possible. For a milder flavor, soak the slices in ice water for 10 minutes, then drain well. 
- In a medium bowl, whisk together the sour cream, vinegar, sugar, pepper, and garlic (if using) until smooth and well combined. Taste and adjust seasonings. 
- In a large serving bowl, combine the drained cucumbers, onion slices, and fresh dill. Pour the dressing over the vegetables and gently toss until everything is evenly coated. 
- Cover the bowl and refrigerate for at least 30 minutes, though 2 hours will yield the most flavorful results.