Wash the cucumber thoroughly and slice it into thin rounds. Thinly slice the red onion as well so it blends evenly throughout the salad. Keeping the slices uniform helps create the perfect texture in every bite.
Place the cucumber and red onion into a mixing bowl. Add the white vinegar, sugar, and salt. Stir everything gently until the vegetables are lightly coated with the dressing mixture.
Sprinkle the chopped fresh dill over the cucumber mixture. The dill provides a fresh aroma and bright flavor that complements the vegetables beautifully. Toss gently to distribute it evenly.
Add the crumbled feta cheese to the bowl. Stir carefully to avoid breaking the cucumber slices while ensuring the feta is spread throughout the salad. The cheese adds a creamy and salty contrast.
For the best flavor, refrigerate the salad for 15 to 20 minutes before serving. Chilling allows the ingredients to blend together and makes the salad even more refreshing.
Transfer the salad to a serving bowl and give it one final toss. Serve cold as a side dish with your favorite meals. Enjoy the crisp texture and fresh flavors immediately.