How to Make It
Heat a large cast-iron griddle or panini press. Add the ham slices to the griddle and cook over moderate heat, turning once, until browned in spots, about 1 minute. Transfer the ham to a plate.
Generously butter the cut sides of each baguette and toast on the griddle over moderate heat until lightly browned, 1 to 2 minutes. Transfer the baguettes to a work surface and generously brush the cut sides with mustard. Layer the ham, pork, Swiss cheese and pickles on the baguette and close the sandwiches.
Generously brush the out-side of the sandwiches with butter and set them on the griddle or press; if using a griddle, top the sandwiches with a large baking sheet and weigh it down with heavy cans or a cast-iron skillet. Cook the sandwiches over moderate heat until they're browned and crisp on the outside and the cheese is melted, 3 minutes per side on a griddle or 3 minutes total in a press. Cut the cubanos in half and serve hot.