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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Halve cucumber lengthwise; slice into ¼-inch-thick half-moons. Cut cauliflower into bite-size pieces. Trim scallions; mince whites and slice greens on a diagonal into ½-inch pieces. Peel and mince or grate ginger. Peel and mince or grate garlic.