Preparation Preheat oven to 400°F. Place whole peppers in one third of an oiled, large 1-inch-deep baking pan. Brush cut sides of eggplants with 1/2 tablespoon oil and arrange next to peppers in pan. Toss onion with 1 tablespoon oil and spread in remaining third of pan. Roast vegetables, turning peppers occasionally, until skins of peppers blister on all sides, about 40 minutes. Transfer peppers to a bowl, cover, and let steam 10 minutes. Continue roasting eggplants and onion until tender and browned, 20 to 30 minutes more, and keep warm, covered. Peel peppers and cut into 1/2-inch-thick strips, discarding stems and seeds. Season vegetables with sea salt and pepper. Serve eggplants topped with peppers and onion. Drizzle with remaining oil and season with sea salt.
Preparation Preheat oven to 400°F. Place whole peppers in one third of an oiled, large 1-inch-deep baking pan. Brush cut sides of eggplants with 1/2 tablespoon oil and arrange next to peppers in pan. Toss onion with 1 tablespoon oil and spread in remaining third of pan. Roast vegetables, turning peppers occasionally, until skins of peppers blister on all sides, about 40 minutes. Transfer peppers to a bowl, cover, and let steam 10 minutes. Continue roasting eggplants and onion until tender and browned, 20 to 30 minutes more, and keep warm, covered. Peel peppers and cut into 1/2-inch-thick strips, discarding stems and seeds. Season vegetables with sea salt and pepper. Serve eggplants topped with peppers and onion. Drizzle with remaining oil and season with sea salt.