Step 1

Make the roast pork: Preheat the oven to 450 F, and line a sheet pan with foil. In a mini food processor, combine all of the pork ingredients, except for the tenderloin, and purée until smooth. Transfer to a medium bowl and add the tenderloin, tossing to coat. Cover in plastic and let marinate on the counter for 30 minutes.

Step 2

Transfer the tenderloin to the prepared sheet pan and pour the marinade over top. Roast until the pork has reached an internal temperature of 140° on an instant-read thermometer inserted into the center, 20 to 25 minutes. Transfer to a cutting board and let rest for 5 minutes, then carve into ¼-inch slices on a bias.

Step 3

Meanwhile, prepare the sandwiches: Rub the outer side of the top and bottom of each loaf with 1 tablespoon of the softened butter and arrange, butter-side down, on a cutting board. Spread 2 tablespoons of yellow mustard on the inside of each piece of bread. On the bottom half of each loaf, layer a quarter of the ham, followed by a quarter each of the pickle slices, roast pork and cheese. Season with a pinch of salt and close with the top half of the bread. Repeat with the remaining loaves and fixings.

Step 4

Heat up a panini maker according to the directions. Then, working in batches, press the sandwiches until golden brown and the cheese has melted, 5 to 6 minutes. Transfer to a board and cut each one in half on a bias, then serve.