In medium bowl, combine marinade ingredients, whisk until blended. Remove 3/4 cup for basting. With a sharp knife, lightly score both sides of meat in a criss cross pattern. Place steak in remaining marinade in dish or gallon size Ziploc turning to coat. Cover and marinade in refrigerator for at least 30 minutes.
Remove steak and discard marinade in dish. Place steak on barbecue grill over medium heat, Grill uncovered, for about 7 minutes each side minutes for medium rare to medium, basting occasionally with reserved 3/4 cup marinade and turning steak once.
Place remaining basting marinade in small saucepan. Bring to boil on stove, or microwave for about 2 minutes.
Meanwhile, carve steak diagonally across the grain into thin slices; arranging on a platter. Spoon hot marinade over steak, garnish with rosemary sprigs and citrus slices if desired. 6 servings.
Notes
note: -If the fresh ginger and garlic are too complicated, you may substitute bottled ginger and garlic in the produce section. Rosemary (fresh herb section) is available in the produce section too. If you don’t want to buy fresh, use dried Rosemary. That will work. It won’t be AS good, but it will work. -If you are a Costco person, they sell very good Flank Steaks in a two pack. You can freeze the second one for Fathers Day ;)