Using a food processor, pulse the walnuts until they are nice and small
Add in your basil and pulse a few times to break it down
Add in your garlic and pulse a few times until everything is incorporated
Now turn your food processor on low and slowly drizzle in your oil so it can all get evenly mixed
You may need to stop and scrape the sides a few times
Once done, season with salt and pepper to your taste liking and enjoy