Deer heart is the best piece of meat on the whole deer.
I just slice it and cook, sometimes with onions, sometimes not.
I cook slow until it is almost cooked. If you show a little bit of pink you have done a perfect job. Deer heart is a muscle. Just like tenderloin or any other choice cut. When you slice it on your plate for a bite, look at the grain on the meat. What you have is the finest grain steak on the whole deer. When you put it in your mouth and slowly chew and savor the flavor you will have appreciated the very best that a deer has to offer. Warm home made bread or biscuits with butter, might be the only thing that would make it better.
PJC
Pat Cameron