How to Make It
Preheat the oven to 350°. In a pie plate, toast 3 tablespoons of the pine nuts until lightly golden and fragrant, about 5 minutes. Set aside to cool.
In a large pot of boiling salted water, cook the fusilli until it is al dente. Drain the pasta and rinse it under cold water, then drain again; transfer to a large bowl.
Meanwhile, in a food processor, combine the cilantro with the basil, oregano and garlic and pulse until coarsely chopped. Add the mayonnaise, olive oil, lemon juice and the remaining 1/4 cup of pine nuts and process until smooth. Season the herb dressing with salt and pepper.
Toss the fusilli with the toasted pine nuts, arugula, tomatoes, red onion and the herb dressing. Season the pasta salad with salt and pepper and serve.