Wash the cherry tomatoes and cucumber thoroughly.
Slice the cucumber into thin rounds.
Halve the cherry tomatoes and set them aside.
Thinly slice the red onion and add it to a large mixing bowl.
Combine the halved tomatoes and sliced cucumber in the bowl.
Chop the fresh parsley and add it to the bowl.
In a separate bowl, whisk together olive oil and red wine vinegar.
Pour the dressing over the salad ingredients.
Season with salt and pepper to taste.
Toss everything gently until well combined.