This teriyaki flank steak is beyond easy and makes for a delicious grilled steak. Teriyaki is a Japanese cooking technique used when a meat is broiled or grilled with a glaze of soy sauce, mirin, and sugar. I add ginger, sesame oil and red pepper flakes to the marinade.
Whisk together all the marinade ingredients in a bowl.
Place flank steak and marinade in Ziploc bag and marinate over night in the refrigerator.
Preheat oven or grill to 450°F.
Remove the steak from the marinade and place it on the grill. Grill for 5 to 7 minutes on each side for medium-rare. Baste each side at least once with the marinade. Let rest 10 minutes. Slice the steak against the grain, into thin slices.