I swore I'd keep this one a secret, but it's too good not to share.

1 cup soy sauce
1 cup worchester
Cover rest of meat with Dr Pepper

Stir the marinade and let it set in the fridge for at least an hour. Longer if you'd like. Pour out marinade. Sprinkle steaks with garlic salt to taste. Get your grill hot and throw them on. Approx 3 min on each side and enjoy. This marinade works great on a boston butt deboned and cut into steaks as well.