Zucchini-Eggplant Napoleons with Tomato, Basil, and Mozzarella

Serves 6 1 medium eggplant, cut into 12 rounds 2 medium-large zucchini, sliced medium thick on the diagonal 1/4 cup extra-virgin olive oil, divided Salt and ground black pepper 1 large tomato, cut into 6 slices and lightly salted 1 ball fresh mozzarella (8 ounces) cut into 6 slices (you will only need about 6...