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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Trim, peel, and cut carrots into sticks (like fries; ours were 3 inches long and 1⁄3-inch thick). Finely chop a few pickle slices until you have 2 tsp (4 tsp for 4 servings). (Save remaining pickle slices for serving.) Drain and rinse beans. Trim and mince scallions.