Slice cucumbers, red onion, and tomatoes. Place in a large mixing bowl.
Make the Dressing:
In a small bowl, whisk together olive oil, apple cider vinegar, sugar, salt, and black pepper until well combined.
Combine:
Pour the dressing over the vegetables and toss to coat evenly.
Add Herbs:
Stir in dried oregano or fresh parsley for extra flavor.
Marinate:
Cover and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve:
Serve chilled as a refreshing side dish with your favorite meals.
