1 apple, thinly sliced, try Ambrosia or Honey Crisp
As needed Dijon mustard
Heat a heavy gauge large skillet over medium- heat.
Generously spread Dijon on 4 slices of bread. Top each slice with Cheddar, 1/4 of the kalua pork, apple slices and additional Cheddar. Place the remaining bread on top and spread with butter.
Place on skillet buttered-side down and butter the remaining side. Cook until cheese is slightly melted and bread is browned. Flip the sandwich and continue to cook until cheese is thoroughly melted and sandwich is golden brown.
You can do this on a Panini press and substitute butter with olive oil.