It is better to make this the day before and let it marinate over night stirring every 3 or 4 hours. If you make it the day of place it in the fridge and mix every hour for at least 3 hours.
This is one step away from being a hybrid over the top Caprese style salad just add your favorite fresh mozzarella to the dish. Slice the mozzarella, lay on a plate, and spoon this salad right over the top. Add an extra drizzle of balsamic vinegar for the final touch.
For more of a Mediterranean style dish you can add feta cheese chunks and diced up Kalamata olives.