The pig's tongue is the tongue of the pig. The pig's tongue, also known as "pig's mouth", is one of the parts of the pig's body with the most movement. Fresh pig's tongue gray-white, smooth envelope, no lumps and lumps, the tongue is soft and flexible, no odor, deterioration of the pig's tongue is gray-green, the surface of the sticky, inelastic, smelly, abnormal pig's tongue is red or purple-red, the surface is rough, there are bleeding points, there are ulcerated spots or lumps, or in the root of pig's tongue has a porcine cyst parasites, due to the pig's tongue contains high cholesterol, high cholesterol should not be consumed by the pig tongue, pig tongue meat is firm, no bones, no cholesterol. The pork tongue is solid, boneless, without fascia, ligaments, and no fibrous texture after cooking. The pork tongue is rich in protein, vitamin A, niacin, iron, selenium and other nutrients, and has the effect of nourishing yin and moistening dryness, and the pork tongue has a flat taste of sweetness and saltiness, and has the effect of nourishing yin and moistening dryness.