Preparation

1. Lightly toast the walnuts in a skillet. Set aside.
2. Put a large pot of lightly salted water on to boil for cooking the pasta.
3. Meanwhile, in the bowl of a food processor chop the cheese until finely ground. Remove and set aside in a medium bowl. In the food processor, pulse the walnuts until smooth. Add the parsley, garlic, and olive oil and pulse until well blended. Combine the walnuts mixture with the cheese, and set aside.
4. When the pasta water comes to a boil, cook the pasta according to package directions. Drain, reserving 1 cup of the pasta water. Return the pasta to the pot and stir in the walnut mixture. Add the reserved pasta water in 1/4 cup increments until the sauce reaches the desired consistency. Toss until combined. Taste and add salt and pepper to taste.
5. Transfer to serving bowls, and garnish with parsley and parmesan shavings.