Here is my London Broil Recipe. I have been using it for years and always get compliments on it. Score the meat, sprinkle meat tenderizer and garlic salt on it, and put it in a plastic bag. Pour oil over it, (I use Canola) and marinate in the fridge for up to 24 hours. I never marinate for less than half a day. Broil or BBQ and cut thinly across the grain. Super easy and very good. By the way, I have also used this recipe on flank steak and it comes out wonderfully too.