In a airtight container or large freezer, ziplock bag add all the marinated ingredients and mix, then add the steak. Marinate for at least 1 hour but overnight for the best flavor.
In a food processor add all the ingredients for the chimichurri sauce. Pulse until blended. Refrigerate until ready to use.
Heat a grill or cast iron pan on high heat. When its ready, add steak and cook over direct heat approx 3-4 minutes then flip and cook another 3-4 minutes.
Remove steak and let rest 6-8 minutes, then slice against the grain for tender meat.