In the bowl of your food processor add walnut halves and garlic cloves. Take for a spin and process until the walnuts and garlic are all evenly chopped up.
Add in Parmesan cheese and basil leaves. Process together until uniform in appearance.
With the food processor still running, pour in olive oil and process to combine.
Enjoy!
To store: cover with a thin layer of olive oil over surface of the pesto. Keep in fridge or freezer.
Notes
This recipe makes a lot of pesto. Feel free to cut the recipe in half or even in a third.