Flank Steak Marinade

Why I Love This Recipe
This is my husbands family's "secret" and "classic" grilling recipe. He would kill me if he knew I was posting it on here but it's too good not to share!
I know that some of the ingredients in this recipe might seem a little odd but the combination is soooo good, you must try it!
Ingredients You'll Need
1/4 cup vegetable oil
1/4 cup soy sauce
2 Tb. Ketchup
1 Tb. Vinegar
Ground Pepper
Minced garlic-a lot!
Directions
Marinate a large flank steak in the sauce for a few hours then grill and slice length-wise in thin pieces.