Mexican tongue tacos are really good.
Fried breaded brains, whether pork or cow, are good too.
We get to be picky in the US because we are so wealthy. In other countries, people don't waste perfectly good food. They can't afford to. They eat the whole animal instead of wasting perfectly good food. Personally, I think it is more ethical to not waste food, especially when the slaughter of an animal was involved in the making of it.
You could be served cow's tongue and not be told and you'd like it. The same goes for horse.