INGREDIENTS
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12ounces(4 to 5 cups) rigatoni
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2medium red onions, sliced into 1/2-inch-thick rings
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2large red bell peppers, cut into quarters
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1tablespoonolive oil
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kosher salt and pepper
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1bunch spinach, stems trimmed, or one 5-ounce package
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1cup(about 3 1/2 ounces) grated Parmesan
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3/4cupbasil leaves, thinly sliced