Make the chimichurri sauce: Finely chop parsley, cilantro, oregano, red onion and garlic or pulse in a food processor. Mix in remaining sauce ingredients.
Marinate the steak: Coat the steak with half of the chimichurri and marinate for 2 hours or overnight.
Cook the steak: Grill or broil the steak on medium high heat for 6-8 minutes on each side or until desired doneness. 125°F for medium rare.
Let it rest: Cover the steak and let it rest for 15 minutes then cut thin slices against the grain.
Serve: Drizzle chimichurri sauce over the steak and serve with more on the side. Happy nomming!
Notes
Use more parsley instead of cilantro for a more traditional chimichurri sauce.