2. Why is pork belly called "pork belly"? This is because it is mainly divided into five layers, namely: the first layer of pigskin, the second layer of lard, the third layer of thin pork lean meat, the fourth layer of lard and the fifth layer of deep pork lean meat. However, the legendary best pork belly has ten layers. Normally, the best pork belly is near the tip of the pig's rear buttock. The pork belly here has three distinct layers, and the thickness of fat and lean meat is equivalent. The thickness of a whole piece of pork belly is about one inch.