IN A LARGE SAUCEPAN COOK PASTA AL DENTE, ONE MINUTE LESS THEN WHAT WRITTEN ON BOX. DRAIN (DON'T DRY THE PASTA TOO MUCH). TURN OFF THE FIRE AND PUT THE PESTO IN THE SAUCEPAN YOU USED FOR THE PASTA.
PUT THE DRAINED PASTA BACK IN THE SAUCE PAN WITH THE PESTO AND STIR.
SERVE HOT WITH MORE GRATED PARMIGIANO REGGIANO CHEESE