Add the basil leaves, pine nuts, and garlic to a food processor (you could also use a mortar and pestle) and process until very finely minced.

Add the olive oil until the mixture is smooth.

Add in the lemon juice and process.

Add the cheese and the pinch of salt before processing it briefly, just enough to combine (you don't want to over-process the mixture). Store in the refrigerator or freezer.