1. Preheat oven to 425 degrees. Butter inside of each roll; spread with mustard. Divide ham, pork, and cheese among bottom halves of rolls. Top with pickles, more mustard to taste, and top halves of rolls. Press down firmly on sandwiches.

2. Heat a grill pan and another heavy pan over medium. With a paper towel, lightly coat grill pan with butter. In batches, place sandwiches on grill pan and weight with second pan. Cook until bread is crisp on the outside, about 3 minutes per side; transfer grill pan to oven and bake sandwiches until cheese has melted, about 5 minutes. To serve, cut sandwiches in half.