Rinse the beef tongue and place it in a 5 qt dutch oven.
Add enough chicken or beef broth to cover the tongue.
Add sliced onion, peeled garlic cloves, sea salt, and pepper.
Cover the dutch oven and bring everything to a boil. This will take about 15 minutes, give or take, depending on your stovetop.
Once it comes to a boil, reduce the heat and simmer for 2.5 - 3 hours. I suggest checking the internal temperature after about 2 hours of simmering to see where it’s at.
Once it's cooked through, use a slotted spoon to transfer it to a cutting board to cool slightly.
Use a knife and tongs to peel off the skin carefully.
Be sure to remove any unwanted fat from the bottom side of the tongue.
Slice the tongue thin and enjoy it as is, or shred the meat and add it to a hot skillet with butter for tacos or burritos.
Notes
Store leftovers once cooled in an airtight container in the fridge for up to 3 days.Reheat the meat in a skillet with a little butter or cooking oil.