Add onions, garlic, bay leaf, salt and cook on low overnight or 8 hours
Remove tongue from crock pot and remove the tough top part of the tongue
Remove the bay leaf
Shred the rest of the meat into strands along with the onions and garlic
Serve with warm taco shells, and toppings of your choice
Authentic Mexican restaurants usually serve tongue tacos. It is a very tender and delicious meat. It is an expensive piece so that is why it's not as common as ground beef tacos. If you try it once, you will be hooked.