One I tried recently and really liked was mixing 1/4 cup of olive oil, 1/4 cup of water, 1/4 cup of red wine, 2 tbspn. of red wine vinegar, and then a packet of McCormicks Peppercorn and Garlic marinade mix (only thing I did different than the package directions was the red wine). Cut your backstrap into 1/2-3/4" medallions and place in marinade for 30 minutes to 1 hour. Grill over medium heat to just under medium. Absolutely delicious. Even my 4 year old son gobbled these up.