I brought home an elk liver about 10 years ago, as my wife said she grew up on liver and onions, and so did I. She cooked up about have of it as she recalled how her mom always made. Either she didn't remember correctly or elk live is not to be consumed by humans.
Since then, the livers and hearts get mixed into the scraps, including the neck and rib meat, when grinding up for the dog. He loves it, and supposedly is good for him.
This year we got two big bodied bucks (mule deer). From the meat left over from last added to the take we got this year, he gets meat for dinner every day for at least the next year. I don't waste anything that is edible on an animal. What we don't eat, the dog is next is next in line. What we don't give him, mainly the thick fat on the back and hind quarters, we dump in the National Forest about a mile from the house. That includes the bones, legs, hide and head. What the coyotes don't eat, the ravens, bluejays, and magpies finish off. Come spring that is any is left, the ants will get.