2tablespoonssoftened butter, or non-stick spray, for grilling
Spread mustard and mayonnaise (if using) on all four slices of bread. On two slices of bread layer: 1 slice cheese, 1 slice ham, pork, pickles, 1 slice ham, and one slice cheese, in that order. Top with remaining bread.
Butter outside of sandwiches or spray with non-stick spray.
Grill in panini grill, pressing down firmly, until golden brown and cheese is melted. If you use a skillet, press down on the sandwich with a large spatula or another heavy skillet while grilling.