After reading a bunch of recipes on the ‘net, I decided to give this a try, with excellent results.
- 1/3 Cup extra virgin olive oil
- 2/3 Cup balsamic vinegar
- 1/3 Cup Shoyu (soy sauce)
- Garlic powder (to taste)
- Salt (to taste)
Marinade the cut of beef for 6+ hours in the fridge then stick it on a grill at 400F and pour half the remaining marinade on the beef. Grill for 10 minutes, flip, pour the rest of the marinade on, wait 10 minutes and remove.  Wait 5 minutes before slicing and enjoy!