Cucumber, onion, and tomato salad

In a large salad bowl, combine the sliced cucumbers, diced tomatoes, sliced red onion, and chopped parsley.
In a separate small bowl, whisk together the olive oil, red wine vinegar, Dijon mustard, minced garlic, sugar (if using), salt, and pepper until well combined.
Pour the dressing over the cucumber, onion, and tomato mixture in the salad bowl.
Gently toss the salad until all the vegetables are evenly coated with the dressing.
Taste and adjust seasoning if necessary, adding more salt, pepper, or vinegar to suit your preference.
Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld together.
Serve chilled as a refreshing side dish or as a light and healthy snack.
Feel free to customize this salad to your taste by adding other ingredients like bell peppers, olives, feta cheese, or avocado. Enjoy!