"Orecchiette are small ear-shaped pasta shells; fusilli or farfalle can be used instead. You can also replace the arugula with two cups whole fresh Italian parsley leaves...."
INGREDIENTS
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2 tablespoons olive oil
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2 large onions halved and thinly sliced (4 cups)
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coarse salt and ground pepper
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12 ounces plum tomatoes cored and diced (about 2 cups)
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3/4 cup lentils picked over and rinsed
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12 ounces orecchiette pasta
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1 bunch (8 ounces) arugula stemmed and coarsely chopped
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1/2 cup finely grated Parmesan cheese plus more for serving (optional)