INGREDIENTS
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Coarse salt and ground pepper
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1 head cauliflower (about 2 1/2 pounds), cored and broken into small florets
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1 medium red onion, halved and cut into thin wedges
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5 garlic cloves, peeled and halved
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1/4 cup olive oil
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4 slices white sandwich bread
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12 ounces cavatappi or other short pasta
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1/4 cup grated Parmesan, plus more for serving (optional)
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1/4 cup fresh parsley, chopped