Using a pressure cooker, boil the beef tongue with the carrots, parsley and radish stems for about 45 minutes.
After boiling the beef tongue, peel off its skin while it is still warm. Make sure to do this while the beef tongue is still warm, as it is difficult to peel it nicely after it has already cooled down.
After peeling the skin, let it cool down. You can keep it in the fridge overnight before cutting it into the size you want.
Grill the beef tongue with a pinch of salt and black pepper. When it is ready, apply a layer of shoyu (soy sauce) on top of it.
Then apply the garlic butter and leave it in the oven for 5 to 6 minutes (depending on the power of the oven) until the garlic butter turns slightly brown.
It is now ready to serve.