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Adjust rack to middle position and preheat oven to 450 degrees. Wash and dry all produce. Trim scallions; thinly slice greens and mince whites. Thinly slice poblanos. Thinly slice jalapeño, removing seeds and ribs for less heat. Zest 1 tsp zest from limes; quarter limes. In a small bowl, combine jalapeño, 1 tsp sugar, salt, and the juice from 1 lime wedge.