Wash the cucumbers and cherry tomatoes under cold water.
Slice the cucumbers into thin rounds.
Cut the cherry tomatoes in half.
Peel and thinly slice the red onion.
Chop the fresh parsley finely.
In a large bowl, combine the sliced cucumbers, halved tomatoes, and red onion.
Add the chopped parsley to the bowl.
In a separate small bowl, whisk together the olive oil and red wine vinegar.
Pour the dressing over the salad mixture.
Season with salt and pepper to taste and toss everything gently to combine.