When I made it the first time the texture was not good (and I ground it three times through fine plate), flavor, not the best. I didn't add any fat and vacuum sealed logs of it and boiled to cook it.
The guy at work made it with (can't find the recipe) somewhere around equal parts I think, deer liver, heart, chicken livers, and salt pork, or pork fat, all the spices, and stuffed it in beef middles. He boiled the liver for ten minutes and then cooled it before grinding. Simmered them until 150 and then smoked them for five hrs. as a after thought. I think the added chicken livers and pork fat made the texture and taste more like real liverwurst. It was really good. He made bread and butter pickled salmon once that was awesome (raw but he said the vinegar cooked it?).
I sometimes fry the deer hearts, but usually I pickle them (cooked first) last year I pickled several deer tongues (left them whole) with the hearts, they were a hit with the guys at a Superbowl party (the women said we were disgusting).