Instructions
In a large mixing bowl, combine the sliced cucumbers, onion, and tomato wedges.
In a separate bowl or measuring cup, whisk together the vinegar, sugar, oil, water, salt, and pepper until the sugar is fully dissolved.
Pour the dressing over the vegetables and gently toss to coat everything evenly.
Cover the bowl and refrigerate for at least 2 hours to allow the flavors to meld.
Stir before serving and enjoy chilled!