"I refuse to eat anything that came out of another animal's mouth, give me an egg salad sandwich anytime."
Gabe Kaplan

Use a thin bladed knife, a filet knife or caping knife works well, and cut the tendon under the tongue, then cut around the base of the organ all the way to the back of the mouth and remove. Boiling is an incorrect term, that will turn the meat into leather, just simmer it at low heat until tender, about 3 hours in a covered pot. You can season the simmering water any way you want. Some folks like to simmer theirs in beef or chicken broth, if I want something that tastes like beef or chicken I'll buy it at the store. Salting the water is a matter of personal taste, I don't since it can toughen the meat. Once the tongue is cooked you need to skin it, then slice it into thin slices for eating fresh , bbqing, or pickling.