A spectacular way to use up leftover pork, but also worth cooking pork just to make these sandwiches
Make sandwiches in this order:
Bread, mustard, cheese, ham, pork, pickles, cheese, mustard, bread.
Brush grill and bread with olive oil. Grill sandwich for a bit, then press hard with something heavy. Turn and do the same on the other side.
If cheese isn't completely melted, put sandwich in a medium oven for a while.