To the pressure cooker, add 4 cups of water and a dash of salt. Cover, and let cook for at least 30 minutes on medium heat. Release the pressure according to your pressure cooker’s specified instructions. The meat should be very tender. If not, add another cup of water and cook again for another 10 minutes, and repeat with releasing the pressure. (If you do not have a pressure cooker, then boil the meat for at least 2 hours. You will need to periodically remove the foam that floats to the top when the meat boils).