Add the shelled pistachios, garlic, parsley, parmesan, lemon zest, lemon juice, salt, and olive oil to the bowl of a food processor. Pulse until all the ingredients are mixed and finely chopped, but there is still some texture left. Remove from the food processor and set aside.
Cook the pasta according to package instructions until it is just al dente.
Drain the pasta, reserving about a cup of the cooking liquid. Toss the hot pasta with about 3/4 cup of the pesto (or more or less to taste.) Splash in a bit of reserved pasta water to create a silky sauce. Note: you may have leftover pesto, which you can save for another meal.
Serve immediately with some extra parsley and chopped pistachios as garnish.
Notes
Try to find the pistachios in their shell, they will be fresher and the flavor is wonderful. Don't use salted nuts if you can help it.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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