Think of this Provençal dish as a more orderly version of ratatouille. We like to use a long Chinese eggplant rather than a stout Italian eggplant to get more slices. If you have a mandoline, this is a good time to use it.
Preheat the oven to 375°F. Toss together in the bottom of a 13 × 9-inch baking dish:
Cut into ¼-inch-thick slices:
Layer the vegetable slices—like dominos, or shingles—in the baking dish, alternating eggplant, zucchini, and tomato, overlapping the slices tightly. If desired, after every third slice, tuck in:
Drizzle the tian with:
Sprinkle with:
Cover with foil and bake for 30 minutes. Remove the foil and bake until all the vegetables are very tender, about 30 minutes more.