I found this one on A.T., just thought I would share.
Ok, here is, by far, the best recipe I have ever found for cooking backstrap.
Ingredients:
Deer backstrap.
Bacon- thin sliced and cheap
toothpics (Long skewers)
cream cheese
kikkoman terakyi-soy sauce maranade
garlic powder (not garlic salt!)
pepper
pepper-Jack cheese- thin slices
1 link of deer sausage- cut or shredded into fine pieces.(or pork sausage)
Jalapenos- remove seeds and cut into slivers
onion- Cut into slivers 1in long
meat tenderizer mallet
Lay the backstap out and cut 3/4 in filets.
Take a meat tenderizor and beat until the meat is flattened out to the size of a softball.
Now dip the meat into a shallow dish of the Kikkoman maranade. Then dust with garlic powder and pepper.
Now spread cream cheese on one entire side of the meat. The more the better.
Now sprinke some of your shredded deer sausage in the middle.
Add your onions and Jalapeno slivers. I usually us 1 or 2 Jap. slivers and 2 or 3 onion slivers.
Now take one side of the meat and roll it all up like a sushi roll.
Wrap the roll in bacon and secure with toothpics.
Now cook on the grill until the bacon is cooked like you like it.
About five minutes before you think they are completely done add the slice of pepper jack cheese to top of each roll and let melt.
Remove and cool for a couple of mintues (the cream cheese will be very hot)
and enjoy. 
I will probably put mushrooms in mine 
