Dice the tomatoes and slice the cucumbers. Finely chop the red onion.

In a small bowl, whisk together the olive oil, red wine vinegar, dried oregano, salt, and black pepper.

In a large mixing bowl, combine the diced tomatoes, sliced cucumbers, and chopped onion. Pour the dressing over the salad and toss gently to combine.

Garnish with chopped fresh parsley before serving.