If you’re using leftover pork: Heat it in a skillet over medium heat until warmed through, stirring frequently. Add a teaspoon of mojo sauce while reheating, if desired.
Cut the Cuban bread into a 6 – 8 inch piece and slice it open.
Lay the bread open and arrange the pork so it covers the bottom half of the bread.
Arrange a thin layer of onions on the pork.
Add mojo sauce, if using. (Unless used to reheat the pork)
Top with sandwich with the bread.
Preheat the sandwich press to medium.
Brush the top of the sandwich lightly with the softened butter.
Gently place the sandwich on the preheated surface and press the top down. Don’t press too hard, just place it and let the weight and gravity start flattening the sandwich. Let it cook until the bread is nice and toasted, about 7 – 10 minutes. Keep an eye on it and check it after 5 minutes to gauge the remaining time.
Cut the sandwich in half and serve.