Combine the sliced cucumbers, halved cherry tomatoes, and thinly sliced red onion in a large mixing bowl and gently toss.

In a small bowl, whisk together apple cider vinegar, olive oil, sugar or honey, salt, black pepper, and oregano.

Drizzle the prepared dressing over the vegetables and toss lightly to coat.

Cover and chill the mixture in the refrigerator for at least 30 minutes.

Before serving, toss again if necessary and sprinkle with chopped parsley or dill.