For the tongue you can make it like you would pulled pork. Peel it and clean it well, do an rub EVOO all over it and then do a spice rub, like to infuse it with some fresh cloves of garlic. Triple rap of tin foil on a bed of sliced Valida onions and bbq at 225-250 on indirect heat for about 7 hours, slice it or pull it apart and serve on buns . It is very good.
Use the tail to make oxtail soup, delicious .
Liver I give to my parents or I will slice it thin and dehydrator for my dogs for liver treats.
The heart ,we never ask for . Had it one time when I was younger ,it was stuffed and serve with a sauce ,didn't like the texture of the meat .