Step 1

Bring a large pot of water to a boil. Cook pasta according to package directions.

Step 2

Meanwhile, combine arugula, Parmesan, sunflower seeds, garlic, lemon zest and salt in a food processor; process until smooth. With the motor running, add lemon juice and oil; process until combined.

Step 3

Reserve 1/2 cup cooking water, then drain the pasta. Transfer the pasta to a large bowl and add the pesto, beans, sun-dried tomatoes, onion and pepper; toss to combine. Add just enough of the reserved pasta-cooking water to get a creamy consistency; toss to coat.