Step four:
Serve
Heat the same grill pan over medium low heat. Brush the sandwiches with the softened butter. Place the sandwiches on the grill pan and press with a small heavy skillet. Cook over low heat for about 2 minutes, turn and continue cooking until the meat is warmed through, the cheese is melted and the rolls are crispy and golden, about 2 to 3 minutes more. Transfer the sandwiches to a cutting board, cut in half and serve with plantain chips.
TIP: For a lighter version of this sandwich, try using low-fat, low-sodium alternative mayonnaise, deli ham and Swiss cheese slices.