In a medium size bowl , add tuna, mozzarella, sweet corn, cherry tomatoes,celery and green onion.
In a small bowl whisk together olive oil, balsamic vinegar, salt, basil and oregano.
Pour dressing over corn mixture, gently toss together, let sit in fridge for 1 hour and serve. (if you prefer room temperature and your house isn't too hot, leave out for 30 minutes before serving). Buon Appetito!