Wash the cucumbers and tomatoes thoroughly under cold water.
Slice the cucumbers into thin rounds.
Halve the cherry tomatoes and place them in a mixing bowl.
Thinly slice the red onion and add to the bowl with tomatoes.
Chop the fresh parsley and mix it in with the other vegetables.
In a small bowl, whisk together the olive oil and balsamic vinegar.
Pour the dressing over the salad mixture and toss gently.
Season with salt and pepper to taste, adjusting as needed.
Serve immediately or refrigerate for about 30 minutes to enhance flavors.