This is a stew recipe I learned from my Nicaraguan friends.
A rough recipe is 1
beef tongue, 5 medium tomatoes, mineral salt and fresh herbs of your choice. You can also add garlic and onions, though I didn't this time.
First, boil the tongue for several hours and remove the outside membrane. Then, add the tongue and peeled tomatoes to a slow cooker. It can be left on high overnight, or for 8-10 hours. Then, remove the tongue and shred or slice thinly. At this point I added the homemade herb salt I had prepared. I used chives in this one, but you can use others like holy basil.