Combine the chimichurri ingredients in a bowl and set aside.
Preheat a griddle/frying pan over medium- high heat. Place the steaks on a plate/cutting board. Season the steaks generously with coarse salt and ground black pepper on both sides. Ensure you pat the seasoning onto the meat for better adherence.
Lay the seasoned steaks on the hot grill. Sear for about 3 minutes on each side, or until you reach your preferred level of doneness. For a medium-rare steak, aim for an internal temperature of around 130-135°F (54-57°C).
Remove the steaks from the grill and allow them to rest for a few minutes. For proper slicing, use a sharp knife to cut them thinly against the grain. Finally, drizzle chimichurri sauce over the sliced steaks.