I've posted about this several times already. There's nothing new under the sun, especially if you're somebody who has been blogging for almost two decades. This oven-baked ratatouille is a summertime specialty. The first photo here shows how it's put together. Rounds of fresh eggplant, zucchini, and tomatoes are packed into a baking dish. Optionally, add some red and green bell pepper strips. I had some, so I added them.

What you can't see is what's under the vegetables. Dice up an onion, and maybe a shallot or two, as well as three or four cloves of garlic. Sauté those lightly in olive oil and put those in the bottom of the dish along with two or three bay leaves. Then layer on the vegetables. Before putting the dish in the oven, drizzle olive oil generously all over the vegetables. Pour into the dish half a cup or so of water and season everything with salt, pepper, and dried thyme or other herbs. Preheat the oven.

Put the dish in the oven, uncovered. Let it bake between 160 and 180 degrees C (325 and 350 degrees F) — it all depends on your oven. Keep an eye on the dish, adjusting the temperature and adding more water as needed so that the eggplant, zucchini, tomatoes, and peppers steam and bake at the same time. Don't stir it. When the vegetables start browning, collapsing, and softening — test them using a skewer, fork, or paring knife — it's up to you to decide when they are cooked enough. It will take an hour or even 90 minutes. Serve this
gratin de ratatouille hot, warm, or cold, as you like it.