Preheat your oven to low broil and slice the submarine rolls lengthwise, ensuring they're cut side up on a lined baking sheet.

Combine melted unsalted butter, minced garlic, chopped parsley, and kosher salt in a bowl and mix well. Brush the garlic butter on the cut sides of the rolls.

Toast the rolls under the broiler for about 2–3 minutes until light golden.

Finely chop the pulled pork, sliced ham, dill pickles, and Swiss cheese on a cutting board; mix with yellow mustard.

Scoop the filling into the toasted rolls and serve immediately.