Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Drain and set aside.

In a blender or food processor, combine the basil leaves, parmesan cheese, olive oil, garlic, pine nuts, salt, and black pepper. Blend until smooth.

In a large skillet, combine the cooked pasta and pesto sauce. Toss until the pasta is evenly coated.

Serve the pasta topped with chopped fresh basil and additional parmesan cheese.