Prepare the Vegetables:
In a large bowl, combine the chopped tomatoes, cucumber, red onion, and green bell pepper. Gently toss the vegetables to mix them evenly.

Add the Olives and Feta:
Scatter the Kalamata olives over the vegetables, then place the feta cheese on top. You can either leave the feta as a whole block, as is traditional, or crumble it for easier serving.

Make the Dressing:
In a small bowl, whisk together the olive oil, red wine vinegar, dried oregano, salt, and pepper. Adjust the seasoning to taste.

Dress the Salad:
Drizzle the dressing over the salad, ensuring everything is lightly coated. Give the salad a gentle toss to combine, being careful not to break up the feta too much.

Garnish and Serve:
Garnish with a sprinkle of fresh parsley or additional oregano, if desired. Serve immediately with warm pita bread or as a side to grilled meats or fish.