re: Needing a good Grilled Backstrap recipe...

Light olive oil, salt & pepper and grilled rare of course.

If you want it more tender, do this:
-cut the strap into 2.5" pieces
-turn the pieces so the cut side is down to the cutting board
-push down with your palm so the muscle tears and it smushes into a patty of sorts
-cook rare

It's so freaking tender, you can cut it with a fork. I finish them with unsalted butter.