Mix: (If you're using a blender or food processor) Add all ingredients except for the oil in a blender or food processor, and mix until everything's finely minced. Make sure not to over-mix it, as this will turn it into a paste.
Combine: (Skip to this step if you're mixing everything by hand) Transfer the mixture into a separate container and pour the oil into it, gently mixing until combined.
Serve: Let the Chimichurri sit for at least 15 minutes for the flavors to fully combine (the longer, the better), and enjoy!