Add all chimichurri ingredients to food processor (or blender). Blend until ingredients are fully combines and chopped. (You can leave a little chunky or go all the way smooth - up to you). Set aside while you prepare the steak.
Preheat grill to Medium-high heat.
Combine seasonings for steak and then sprinkle on both sides of flank steak.
Add steak to hot grill. Cook for 8-10 minutes on each side (this will make the steak medium, adjust to desired level of doneness).
Remove steak from grill and let rest at least 5 minutes before slicing. Pour chimichurri over the top.
Keyword chimichurri, flank steak, hot sauce, steak