1. Slice the tomatoes and mozzarella.

2. Peel and slice the onions into thin rings.

3. Mix all the ingredients in a bowl.

4. Add mayonnaise, sunflower oil, and dressing, and mix well.

5. Season with salt and pepper.

6. Let the salad marinate in the refrigerator for at least 30 minutes.

7. Mix again before serving and enjoy!