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Adjust rack to middle position and preheat oven to 425 degrees. Wash and dry produce. Cut broccoli into bite-size pieces, if necessary. Halve, peel, and thinly slice onion; mince a few slices until you have 2 TBSP (4 TBSP for 4 servings). Peel and grate half the garlic clove (whole clove for 4). Halve buns.