Combine all of the ingredients for the marinade in a large resealable plastic bag. Squish everything around the pork. Seal and place in the fridge for 2-6 hours.
To Make Chimichurri
Add everything but the olive oil to a small food processor or blender
Pulse until finely chopped.
With the food processor on, stream in the olive oil until you get the desired consistency.
Cover and store in the fridge until ready to serve.
To Cook Pork
Preheat grill to medium - approximately 350º F.
Grill the pork for about 35-40 minutes depending on the size, turning regularly.