Meanwhile, add the rigatoni to the other pot of boiling water ... Add the oil and process until smooth. Transfer the pesto to a large bowl and stir in the 1/2 cup of Pecorino and the lemon ...

Penne is a good pasta for this dish, but you can use other short pastas like rigatoni or ziti. —Annie Wayte Toss the shrimp with half of the basil, 2 Tbs. of the olive oil, and the lemon zest.