(Optional) Marinate the Steak: In a bowl, whisk together with Worcestershire sauce, Soy sauce, Lemon juice/zest, Salt, and Pepper. Add Chimichurri to the marinade for even more flavor. Place the steak in a ziplock bag or airtight container and pour the marinade over it. Allow to marinade for at least 30 minutes, or up to 4 hours in the refrigerator.
Prepare the Chimichurri: In a medium bowl, combine parsley, cilantro, garlic, red wine vinegar, olive oil, oregano, red pepper flakes, salt, and pepper.
Mix well: Stir until well combined. Taste and adjust seasonings as needed. Let sit for at least 15 minutes.
Preheat grill to medium-high heat (450°F/232°C).
Season steak with salt and pepper.
Grill steak for 3-5 minutes per side for medium-rare (130-135°F/54-57°C) or 5-7 minutes per side for medium (135-145°F/57-63°C).
Check internal temperature. Use a meat thermometer to ensure perfect doneness!
Rest steak for 10 minutes before slicing against the grain.
Place the Chimichurri Steak on a platter and Garnish generously with chimichurri sauce and serve immediately