We use elk burger for pretty much anything we'd use regular beef burger on...
Tacos
Spaghetti
Meatloaf
etc, etc, etc
Typically, elk burger is a tad dry compared to beef because it's so low in fat content. You might add beef sewit (sp). If you do, I'd recommend 1 lb. of sewit to 10 lbs of elk grind.
What ever you do, don't try to use elk fat.......ewwww!
If you feel the flavor's a little strong (gamey), add some garlic. I typically use garlic salt in place of regular salt with venison anyway.
M-Y