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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Cut cauliflower into bite-size pieces if necessary. Thinly slice jalapeño into rounds, removing ribs and seeds for less heat. Zest and quarter lime. Trim and thinly slice scallions, separating whites from greens. Finely chop cilantro. Dice tomato into ½-inch pieces.