Preheat your grill or grill pan to high heat
Season both sides of the flank steak generously with salt and black pepper
Grill the steak cuts for around 4 minutes per side or until it reaches your desired level of doneness (medium-rare is recommended)
Remove from heat and let rest for a few minutes before slicing against the grain into thin strips
Serve with chimichurri sauce on top or on the side