1/4 c. soy sauce
2 tbsp. honey
2 tbsp. vinegar
1 tsp. garlic powder
1 tsp. ginger
3/4 c. oil
1 tbsp. catsup
1 tbsp. chopped onion

Mix ingredients and place in plastic bag. Place 1 flank steak in bag and mix marinade so it covers steak. Marinade 3 hours. Barbecue to medium.