In a small bowl, add the marinade ingredients. Whisk to combine.
Place flank steak in ziplock bag or airtight container. Pour marinade into bags, covering the steak.
Place ziplock bags in refrigerator and marinate for at least 5 hours, or overnight
Fire up grill to medium-high heat, about 375°F (190°C)
While grill warms up, remove flank steak from marinade. Pat dry with paper towels to remove excess marinade.
In a small bowl, combine dry rub ingredients. Use a fork to crush or remove any lumps that form.
Apply the dry rub to the flank steak, covering evenly and across both sides of the meat
When grill is at 375°F, place flank steak on grill grates over direct heat. Grill for 5 minutes per side, or until internal temperature hits 130°F (55°C) for medium-rare.
Remove steak from grill and wrap in aluminum foil. Rest for 10 minutes.
Unwrap steak and slice meat against the grain into thin strips
Serve and enjoy