Add basil leaves, 1/2 cup of the Parmesan, pine nuts, 1 garlic clove and salt and pepper to a food processor or blender. Turn machine on, and then drizzle in the olive oil while it mixes. Continue blending until completely combined, taste, and add additional garlic clove, salt or olive oil if needed.
Store in an airtight container for up to a week in the refrigerator.