Bring a large pot of well-salted water to a boil over high heat.
Meanwhile, put the arugula, Parmigiano, walnuts, lemon juice, garlic, and 1 tsp. salt into a food processor, and process until the mixture is finely ground, 30 to 60 seconds. In a measuring cup, combine the olive oil and walnut oil. With the food processor running, drizzle the oil through the feed tube, and process the mixture until mostly smooth.
Cook the fettucine in the boiling water until it’s al dente, 6 to 8 minutes. Drain. In a medium bowl, toss the fettucine with enough of the pesto to generously coat the pasta. Serve sprinkled with extra Parmigiano, if desired.
A caesar salad, served either with or after the pasta, is a good complement.
nutrition information (per serving):
based on six servings;