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Place a lightly oiled baking sheet on top rack (for 4 servings, use 2 lightly oiled baking sheets on top and middle racks) and preheat oven to 450 degrees. Wash and dry produce.
Trim and halve zucchini lengthwise; thinly slice crosswise into half-moons. Halve tomatoes. Peel and mince or grate garlic. Zest and quarter lemon.