Using blender or food processor, grate enough Parmesan chees to make one cup; add basil. The add melted butter, followed by garlic, pine nuts and finally the oil. Allow each ingredient to blend smoothly with the preceding ones, then let stand 1 hour. This is the Pesto Sauce.
Prepare pasta according to package directions. Mix pesto with pasta fresh from the boiling water. Do not add too much pesto, but allow each person a chance to adjust flavor by taste, by adding more pesto if desired. Leftover pesto will last for a long time if refrigerated in a plastic container, but do not freeze.
A light salad with oil and vinegar dressing and a veal dish go great with this. Pasta Con Pesto is also a versatile accompaniment to a variety of dishes-meat, fish, poultry, etc.