1. Whisk olive oil, balsamic vinegar, lemon juice, oregano, garlic, salt (if using), black pepper, parsley, and onion together until well combined. 2. In a large bowl stir together the tomatoes, cucumber, red bell pepper and olives. 3. Stir in the dressing then toss to combine. 4. Gently toss in the cheese. 5. Let sit for 20 minutes to allow flavors to meld a bit. Serve room temperature or cold. Enjoy!