Combine oil, soy sauce, vinegar, honey, garlic powder, ginger and onion. Place steak in plastic bag; add marinade, turning to coat. Tie bag securely and marinate in refrigerator 4 hours, turning at least once.
Drain marinade from steak, reserve. Place steak on rack in broiler pan so surface of meat is 3-4" from heat and broil to rare or medium (20-30 minutes), turning and brushing with marinade. Carve steak into thin slices.
541 calories, 35 grams fat, 5 grams carbohydrates, 49 grams proteinper serving. This recipe is low in carbs.