Pasta with Arugula Pesto and Tomatoes

Susan from Food Blogga

Serves 4-6

6 oz. arugula, tough stems removed (about 4 cups)
1/4 cup fresh flat-leaf parsley leaves
1/4 cup walnuts
1 garlic clove
1/4 cup grated Pecorino Romano cheese, plus extra for garnish
salt and freshly ground pepper, to taste
1/3 cup extra virgin olive oil
2 cups cherry tomatoes, halved, or chopped large tomatoes 

1 pound pasta of your choice

In a food processor, combine the arugula, parsley, walnuts and garlic. Process using short rapid on-off pulses until the mixture is finely chopped, 15 to 20 times. Add the grated cheese, salt and pepper. With the machine running, gradually add the olive oil in a steady stream and process until smooth. (Add additional water or olive if necessary.) Set aside. 

Meanwhile, bring a large pot three-fourths full of water to a boil over high heat. Salt generously and add the pasta. Cook, stirring frequently, until al dente (tender but firm to the bite). Drain the pasta, reserving about 1/2 cup of the cooking water.

Place the pasta in a large warmed serving bowl along with the pesto. Toss well, adding the reserved pasta water as needed to thin the sauce. Add the tomatoes and toss again. Garnish with cheese and serve immediately.