Preheat the griddle. Slice the bread loaves in half. Smear the butter on the cut sides of the bread. Add a dash of mustard and mayonnaise. Build each sandwich with the roasted pork, ham, cheese, and pickles. Place the sandwich on the hot griddle, cover with a sheet of aluminum foil, and place heavy iron skillet or sandwich press to flatten. Grill the sandwich for a few minutes on each side.
Slice in half diagonally and serve.