Preheat oven to 4251. Line baking sheet with foil and lightly grease with cooking spray.
Season the pork all over with salt and pepper to taste. Transfer the pork to the baking sheet and roast until the internal temperature reaches 145' about 15 minutes.
During the last 5 minutes of cooking time, add the quartered ham steak to the baking sheet to warm through and place the baguette halves, cut side up, directly on the oven rack to lightly brown.
Transfer the tenderloin to a cutting board and let it rest, tented with foil, for 5 minutes. Then cut it into 8 slices.
Spread 1 1/2 teaspoons of the mustard over the cut sides of each bottom piece of baguette. Top with ham steak quarter, 2 slices of tenderloin, a slice of Swiss cheese, and 2 slices of pickle. Place the other half of the baguette on top, press the sandwich down firmly with the hand and dig in.