Steps
1. In a salad bowl, combine chopped tomatoes, sliced cucumber, red onion, and Kalamata olives.
2. In a small bowl, whisk together olive oil, red wine vinegar, dried oregano, salt, and pepper to make the vinaigrette.
3. Pour the vinaigrette over the salad and toss gently to coat all ingredients.
4. Sprinkle crumbled feta cheese on top.
5. Serve immediately or chill for 10 minutes for flavors to blend.