Ingredients

1/4 cup vegetable oil
1/4 cup soy sauce
2 tablespoons distilled white vinegar
2 tablespoons ketchup
2 tablespoons crushed garlic
1 1/2 pounds flank steak

Directions

In a small bowl, mix vegetable oil, soy sauce, vinegar, ketchup, and crushed garlic. Place flank steak in a large resealable plastic bag. Pour the marinade over steak. Seal, and marinate in the refrigerator at least 3 hours.

Preheat grill for high heat.

Oil the grill grate. Place steaks on the grill, and discard marinade. Cook for 5 minutes per side, or to desired doneness.