The starch in the water will help to thicken the sauce and allow it to coat the penne or beta linguine (or whatever shape you choose). Return the drained pasta to the hot pan, add a tablespoonful or so of pesto, and add the water a little bit at a time until the sauce reaches the desired consistency. Since pesto has a very concentrated flavor, make a pasta sauce by reserving a cupful of beta the pasta cooking water when you drain the pasta. It is most commonly used as a pasta sauce.
Pesto is an aromatic herb paste, traditionally made from fresh basil, garlic, Parmesan cheese, pine nuts, and olive oil. Italian beta Wines Pesto's Place. Wine Dinners: Made in Italy. Pasta beta Cooking Basics.