Mix all ingredients together in a ziploc or a large dish.
Add the flank steak and marinate (covered) in the fridge overnight or at least all day.
Heat the gas grill to high heat. Remove the steak from the marinade and lay on the grill for 2 minutes per side. Then turn down to medium and cook another 7-10 minutes, flipping halfway again, or until an internal temperature of 130 for medium rare, or longer for medium etc. Remove and set aside to rest on a cutting board with foil draped over the top.
Meanwhile, place 1/2 of the remaining marinade in a sauce pan over medium heat.
Bring the marinade to a simmer for 10 minutes, set aside.
Slice the steak against the grain and serve with a drizzle of additional sauce if desired.
Notes
Flank steak is a lower quality of meat so cooking to well done will make it more chewy. It's incredibly flavorful and delicious when cooked properly!!
