Wash all vegetables thoroughly.
Slice the cucumbers into thin rounds or half-moons.
Halve the cherry tomatoes.
Thinly slice the red onion; soak in cold water for about 10 minutes if you prefer a milder taste.
In a large bowl, combine cucumbers, onions, cherry tomatoes, and chopped herbs.
In a separate bowl, whisk together olive oil and red wine vinegar; season with salt and pepper.
Pour the dressing over the vegetable mixture and toss gently until well coated.
Cover and refrigerate for at least 1 hour (or overnight) to allow flavors to meld before serving.
