For a different flavor (I think better), lightly toast pine nuts in the oven on a cookie sheet at 400 degrees.
Variations by Joseph Mach: Add caramelized onions and roasted red pepper. Make sure red pepper is not blended in to give small red chunks to the mixture.
In a food processor or blender, blend pine nuts, basil leaves, salt, and garlic until it forms a thick paste. Add oil and cheese slowly while pulsing processor. Continue adding oil and cheese until proper consistency (like the thickness of blue cheese salad dressing). It should have a bright green color and strong flavor. Toss over freshly cooked pasta with a little butter or oil. Serve immediately.