We saw this on one of our TV shows, the diner guy chopped a pork tenderloin into smallish pieces, put them into a small hotel pan, and started adding marinade ingredients.  I scribbled them down as best I could because we had just bought a tenderloin and this looked like a great recipe:  Olive oil, lemon juice, lime juice, garlic, oregano, salt and pepper.  He said cover and refrigerate for a week.  OK.  We nearly forgot it because it was in the basement fridge but we got it out in time.I wish I had let the grill heat better but I was afraid to overcook the meat.  I brushed it with garlic oil while it was on the grill and that really flared up.  I did manage to get a touch of brown on there.  It was really tender, and the garlic was prominent.  I think the long marinade in lemon/lime juice had o lot to do with tenderizing it.  I served it over a bed of wild rice with a side of Brussel sprouts and corn sauteed in duck fat.