Preheat your oven to low broil, then slice the submarine rolls lengthwise without cutting all the way through. Place the rolls cut side up on a parchment-lined baking sheet.

In a mixing bowl, combine the melted unsalted butter, minced garlic, finely chopped parsley, and kosher salt. Stir until thoroughly mixed, then generously brush this garlic butter onto the cut sides of the rolls.

Carefully place the baking sheet under the broiler for about 2–3 minutes, watching closely for them to turn lightly golden and crispy.

On a cutting board, dice the pulled pork, sliced ham, dill pickles, and Swiss cheese into bite-sized pieces. Stir in yellow mustard until well combined.

Once the rolls are toasted, scoop the filling into each roll and serve immediately while warm and melty.