Mix the mayonnaise and mustard together and set aside. Whisk the eggs and milk together in a shallow bowl and set aside. Line up the bread to make 4 sandwiches, making sure each slice of bread matches with his brother. Coat each slice of bread with some of the mayonnaise mixture. On the bottom slice layer pork, then ham, then the pickle, then the cheese, and finally the bread slice top. Heat a skillet or griddle and put enough butter in to coat it thoroughly. Have the egg mixture near the stove. Gently dip one of the sandwiches into the bowl, and turn so it has soaked on both sides, then carefully put it in the pan. Do this to as many sandwiches will comfortably fit into your pan or griddle. Turn the heat to low and cover. Let the sandwiches cook, covered, about 5 minutes or until nicely brown, Turn and let cook for another 3-4 minutes, or until the bottom is nicely browned. Remove from the pan, plate and cut in half for serving.