INGREDIENTS
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Coarse salt and ground pepper
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3/4 pound large pasta shells
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2 tablespoons unsalted butter
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1 large yellow onion, diced medium
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3 garlic cloves, minced
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2 bunches kale (1 1/2 pounds), tough stems and ribs removed, leaves coarsely chopped
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2 cups shredded or chopped cooked chicken (from 1/2 rotisserie chicken)
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1 container (48 ounces) part-skim ricotta
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3 tablespoons finely grated lemon zest (from 2 lemons)
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3/4 cup Parmesan, grated (2 1/4 ounces)