The final one, undisputed king and so popular most people don't even realize and connect the dots it is actually offal is chicken hearts. They are a staple of Brazilian barbecue. It's just a fucking good piece of meat from a chicken, it has a much stronger flavor than the rest of the animal being more like a duck than a actual chicken and the fat on it makes it deeply savory. It's extremely common on any even just decent BBQ place and absolutely a must in buffet BBQ. It's good no matter how well done too, meaning if you arrive as the restaurant has just opened and the hearts have just barely warmed it is tasty but if you are eating the last ones in the skewer that are shriveled up and well done they still are good tasting now less like duck and more like crispy bacon or something, which I suspect is part of what makes it good for buffets.