I got a nice message with photo from a customer today. Here is his email (the photo is above):
Picked up a nice Mangalitsa heart from you last Saturday. Cooked it last night and it came out great! A very simple preparation: marinated in soy, sherry and a few other Asian things, then garlic, carrot, onion, and a little splash of stock plus a super hot pan. I can't normally get my wife to eat much of the "nasty bits", but she cleaned her plate.My wife and I distinguish between muscles like the heart, tongue and jaw muscle and things like liver and kidneys. We eat the muscles without any reservation. We'll fight (like pigs) over the jaw muscles, which are particularly tasty.
I heard that in Spain they remove cuts like the eye muscles, which have an official designation and get marketed, the way we'd market the trotters or picnics.