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Place a lightly oiled baking sheet on top rack (for 4 servings, 2 baking sheets, on top and middle racks) and preheat oven to 450 degrees. Wash and dry all produce. Trim and halve zucchini lengthwise; thinly slice crosswise into half-moons. Halve tomatoes. Mince or grate garlic. Zest and quarter lemon (for 4, zest 1 lemon; quarter both).