1Warm a large skillet over medium-high heat. Add the sliced roast pork and the bottled mojo, toss for 2 to 3 minutes until the pork is hot and the liquid has mostly cooked down. Move to a plate and wipe out the skillet.
2Spread mustard on the cut sides of every roll. Layer the bottoms with swiss cheese, ham, the mojo pork, pickle chips, and one more slice of swiss on top. Close the sandwiches and spread the softened butter on the outside of the rolls.
3Heat the clean skillet over medium heat. Set in as many sandwiches as fit, then weigh them down with a heavy pot or a second skillet. Press and toast for 3 to 4 minutes, until the underside is golden.
4Flip each sandwich, press again for 3 to 4 minutes until the cheese is melted and the bread is crisp. Repeat with any remaining sandwiches. Slice on the diagonal and serve hot.