A century ago, when consumers were still indoctrinated with the traditional attitude that every part of an animal must be used, offal and specialty meats were widely popular. Their popularity and availability dwindled throughout the 20th Century, but the broadening of cross-cultural culinary horizons has revived interest in meats like kidney, tripe and tongue. Cold tongue was a staple for sandwich making and the cold buffet table, and is easily prepared at home.
Rinse the tongue under cold running water and place it in the saucepan. Add enough cold water to cover and salt lightly. If you are using the tongue in a specific recipe, season the cooking liquid as directed in the recipe.
Place the saucepan over medium heat and bring it up to just below boiling temperature. Simmer the tongue gently until tender, approximately three to four hours depending on size.
Remove the tongue from the saucepan with tongs or a carving fork and allow it to cool until it may be handled comfortably. Use the tip of a sharp knife to score the skin of the tongue, dividing it into two or more pieces.
Place the tongue on a cutting board and slide the tip of the knife under the skin at the tip of the tongue, until you have loosened a large enough portion onto which you can get a grip. Grasp the skin firmly between thumb and forefinger, using a clean cloth, if desired, for better grip. Pull back on the skin, peeling it from the tongue. It should come easily, with only moderate force.
Repeat for the rest of the skin. Turn the tongue so you can see the thicker portion at the base. There will be several pieces of gristle there, which will be plainly visible. Remove these as well, with the knife. The tongue is now ready for use or may be wrapped and refrigerated.