Step 1- Gather your ingredients. Get everything measured and ready before you start this recipe moves fast once you begin.
Step 2- Whisk the marinade. Whisk the water, vinegar, oil, sugar, salt, and black pepper together in a large bowl until the mixture looks smooth and slightly cloudy from the sugar dissolving.
Step 3- Add the vegetables. Add the sliced cucumbers, tomato wedges, and onion rings to the bowl. Stir everything gently to make sure each piece gets coated in the marinade.
Step 4- Chill and marinate. Cover the bowl with plastic wrap and refrigerate for at least 2 hours for the best flavor results. If you can stand the wait, letting it sit overnight makes the flavors even more pronounced.