Wash the cucumbers, tomatoes, and onions thoroughly. Slice the cucumbers into thin rounds, chop the tomatoes into bite-sized pieces, and create thin rings from the onions.

In a large mixing bowl, combine all these vibrant ingredients.

In a separate bowl, whisk together the vinegar, oil, water, sugar, and seasoning.

Pour the dressing over the mixed vegetables and toss gently.

Cover and refrigerate for at least one hour.

Toss again before serving.