2 pounds tomatoes (6 medium or 4 large)
1 medium eggplant (1 pound), diced into ½-inch cubes
1 large bell pepper (about 8 ounces), cut into 3/4-inch squares
1 medium-to-large zucchini (about 16 ounces), diced into 1/2-inch cubes
5 tablespoons plus 1 teaspoon extra-virgin olive oil, divided
3/4 teaspoon fine sea salt, divided, more to taste
1 medium yellow onion, chopped
4 cloves garlic, pressed or minced
1/4 cup chopped fresh basil
1/4 teaspoon red pepper flakes, more or less to taste
1/4 teaspoon dried oregano
Freshly ground black pepper, to taste
Preheat the oven to 425 degrees with one rack in the middle of the oven and one in the upper third.
Blitz the tomatoes in a food processor until they are broken into a frothy pulp. Set aside.
Chop the zucchini, eggplant, and pepper.
On one baking sheet, toss the diced eggplant with 2 tablespoons of the olive oil until lightly coated. Arrange the eggplant in a single layer across the pan, sprinkle with ¼ teaspoon of the salt, and set aside.
On the other baking sheet, toss the bell pepper and zucchini with 1 tablespoon of olive oil and 1/4 teaspoon salt. Arrange the vegetables in a single layer.
Place the eggplant pan on the middle rack and the other vegetables on the top rack. Set the timer for 15 minutes.
Meanwhile, warm 2 tablespoons of the olive oil in a large soup pot over medium heat. Add the onion and 1/4 teaspoon salt. Cook, stirring occasionally, until the onion is tender and caramelizing on the edges, about 8 to 10 minutes.
Add the garlic, stir, and cook until fragrant, about 30 seconds. Add the tomatoes and reduce the heat to maintain a gentle simmer.
Once 15 minutes are up, remove both pans from the oven, stir, and redistribute the contents of each evenly across the pans. This time, place the eggplant on the top rack and other vegetables on the middle rack.
Bake until the eggplant is nice and golden on the edges, about 10 more minutes (the eggplant will be done sooner than the rest). Remove the eggplant from the oven, and carefully stir the eggplant into the simmering tomato sauce.
Let the zucchini and bell pepper pan continue to bake until the peppers are caramelized, about 5 to 10 more minutes. Then, transfer the contents of the pan into the simmering sauce. Continue simmering for 5 more minutes to give the flavors time to meld.
Remove the pot from the heat. Stir in 1 teaspoon olive oil, the fresh basil, and red pepper flakes. Crumble the dried oregano between your fingers as you drop it into the pot. Season to taste with additional salt and black pepper.