Make the pesto: In a food processor, pulse parsley, garlic, red-pepper flakes, lemon zest, and 1 teaspoon salt until coarsely chopped. With machine running, add oil in a slow, steady stream, processing until blended.
Bring a large pot of salted water to a boil. Cook pasta until al dente. Drain, reserving 1/4 cup pasta water.
Toss pasta with pesto and Parmesan, then with reserved pasta water. Grate more lemon zest over each serving, and season with pepper.
So simple, so delicous. Will definately make it again. It reminded me of summer time, it has a very light and fresh taste.
Unfortunately, I don't have the taste buds for parsley so I used cilantro instead and it turned out delicious! My boyfriend loved it and said it was light and tasty! Definitely adding this recipe to the book! Thanks Martha! =]