You need to add some pork fat. Bison is very low-fat meat, and in burgers or steaks, it tastes dry, dry, dry. Like powdered toast.
Add some pork (or beef) fat to the burger meat and it gets real tasty.
Just had some bison top sirlion this evening. 1" thick on the grill 4 1/2 min per side on high. Very tasty and juicy. Like all lean meat don't cook the s#$t out if it.
Thanks for the suggestion. It makes me remember my son’s beef hamburgers. He made a well in the center of the patty with a spoon, added a pat of real butter, then topped it with about a tablespoon of Worchester sauce. Yummy. Could help bison, too.