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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Cut cauliflower florets into bite-size pieces if necessary. Halve, peel, and finely dice half the onion (whole onion for 4 servings). Drain chickpeas, reserving 1⁄4 cup liquid (1⁄2 cup for 4). Pick cilantro leaves from stems.