My Bavarian grandmother made a heart stew to die for, even my mother could make it....
We always used beef heart but any critters will be as good, this is a very complicated recipe with exacting measurements,
Cut up heart, quick brown in fat or oil, add 1 sliced onion, cook a little more, salt pepper to taste, cover with water and simmer, add 3 glugs of white vinegar, finish simmer to tender.
Now the magic, make a medium dark roux, add to stew, cook a little more to thicken stew, serve over egg noodles., Like I said, complicated....
If you want to fancy it up, add some celery or other vegetables, use stock instead of water, use mashed potatos instead of noodles, but it's hard to beat the original recipe of Bavarian farm poverty food.