The longer you let this bad boy marinate, the better. When grilling, I always sear the outside of the steak real good, those crusty burnt parts are the best part.
1/4 cup soy sauce
2 T salad oil
2 T honey
1 T red wine vinegar
1 clove garlic
1 t minced fresh ginger or 1/2 t ground ginger
Mix together. Marinate 1 large flank steak for several hours with marinade. Grill steak to your preference. Let rest for 5 minutes. Slice on the diagonal.