Cut 3 1/2 pounds of lean pork, can include some bones, and 2 pounds of fatty pork into 2 inch cubes and transfer them to large casserole. Add the salt, pepper, nutmeg, allspice, dried thyme, bay leaves, and water. Bring the water slowly to a boil, stirring constantly, cover tightly and cook in a 300 degree oven for 4 to 5 hours or until all the fat has melted and is clear. The rillettes should cook slowly and never boil. As liquid evaporates, add more water gradually to prevent the meat from sticking. Drain pork and discard bay leaves. Reserve fat. Shred meat with two forks, discarding bones. Add the fat and mix it with meat. Taste for seasoning. Transfer rillettes to a stone crock, cover with more fat, and then plastic wrap. Chill the rillettes for at least 2 days before serving. Sealed like this the rillettes can be kept for up to 2 weeks.