Preheat oven to 190°C.
Pour prepared Marinara sauce into the baking dish you plan to use and top with the olives.
Cut all vegetables into similar sizes. Arrange slice vegetables, alternating as you go on top of sauce in rows, fitting them tightly together until dish is filled. The more careful you are at this point, the more beautiful your Tian will look once cooked.
Season with salt and pepper. Drizzle with plenty of EVOO.
Bake, covered with foil, for 1 hour. Then another 30 minutes, uncovered, until vegetables are tender and you can see they are just browning.
Serve hot or cold. We love it both ways.