Hearts get fried in bacon grease. You can tell they're good if you can feel your arteries harden.
Liver is fed to the cat. She likes it raw. She can tell when I'm cutting up liver and starts purring and rubbing against my legs.
I don't eat it for two reasons. #1-I'm not a big fan of liver unless it's liverwurst. I like a good liverwurst sandwich.
#2 is most of my hunting has been NH and MI. In NH, it is strongly advised not to eat deer liver. The reason is that the high sulfur coal from industry in the Rust Belt is taken by prevailing westerly winds toward the Northeast. Particulates return to Earth with the rain which is acidic. This leeches trace heavy metals from the ground and is absorbed into plants eaten by animals and accumulates in their liver. NH Fish and Game advises that if you must eat deer liver, only one per year per person should be safe as long as it comes from a yearling. Cadmium poisoning is a real thing boys and girls. And it will accumulate in your liver too. Remember, your liver is your oil filter and it isn't easily replaceable. I want to be shot by a jealous husband, not die a slow, painful death by heavy metal poisoning.
When hunting in Michigan, as my BIL explained, "We don't have acid rain here. We send it out east to you." Liver there is safe. Enough so that my late, ex-Father-in-Law (he was ex by that time), who absolutely loved deer liver, would be delighted when I came back every year with 3 or 6 deer livers. I would get trout in return.
Except for the year he lost his license.