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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Line a baking sheet with foil. Wash and dry produce.
Halve, peel, and cut onion into ½-inch-thick wedges. Cut tomato into ½-inchu0002thick wedges. Peel garlic and place in the center of a small piece of foil; drizzle with olive oil and season with salt and pepper. Cinch into a packet.