In a air tight container or large freezer ziplock bag add all the marinated ingredients and mix, then add the steak. Marinate over night for 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.