Combine Tomatoes and Onion
Place chopped tomatoes and sliced onion in a large bowl.
Mix the Dressing
Whisk olive oil, vinegar, garlic, sweetener (if using), salt, and pepper in a small bowl.
Dress the Salad
Pour the dressing over the tomatoes. Toss gently to coat.
Let It Marinate
Let sit at room temperature for 15–30 minutes.
Finish and Serve
Sprinkle with fresh herbs before serving. Add cheese, avocado, or cucumber if desired.