Clean her out really good, cut in half & then into stir fry (like) strips.
Heat bacon fat in cast iron & add sliced onion, cook over moderate heat till just translucent, remove from pan.
Add sliced mushrooms & cook till starting to colour.
Turn up heat & add seasoned (salt & cracked black pepper) heart strips, add back onions & basically just stir fry !
I'd serve it in a nice crusty roll with an ice cold beer.
Voila - done.
Like any game meat, do not ruin by over cooking.
