Preheat oven to 350°F. Lightly butter a 9 by 13-inch baking dish and set aside.
Melt butter in small saucepan over medium heat. Stir in Dijon mustard, Worcestershire sauce, dried onion, lime juice and oregano. Cook until it begins to simmer, then remove from heat and set aside.
Split Hawaiian rolls in half and place bottom half of each into prepared baking dish.
Spread bottom halves with yellow mustard and then top each with two pieces of cheese. Add small mound of pork to each, then top with slice of ham. Place two pickle chips on each sandwich and then place top part of the bun over pickles. Firmly press down on sandwiches to flatten.
Stir butter sauce once more and then pour evenly over sandwiches. Bake until golden brown and toasty, about 10 to 15 minutes. Remove from oven and serve immediately.
