Place the port in a deep, thick-bottomed soup pot, fill the pot three-quarters full with water, and bring to a boil. Cover, and continue boiling over medium heat for one hour, occassionally skimming off any scum. (If too much water boils off and the pork is not completely covered, add more boiling water.) Remove pork from heat, and cool down enough to cut into 1-1/2 inch chunks.