Start by preparing the Italian vinaigrette first. Take a mixing bowl and add Dijon mustard, thyme leaves, parsley leaves, and red wine vinegar. Mix them.
Slowly pour the olive oil into the mix and keep whisking to emulsify it. Add in the salt and pepper according to your taste.
Now, you can move forward to assembling the sandwich. Take the hoagie roll and slice it lengthwise. Don’t slice all the way through, as that would result in the stuffing falling out. Scoop out some of the bread from the top half to make more room for the stuffing.
Drizzle some of the Italian vinaigrette on the inside of the bread roll. Season it with salt and crushed pepper. Layer the salami on the bottom half. Then put mortadella, ham, or prosciutto followed by the provolone cheese slices. Top it off with the tomato slices. Add the pepperoncini if using any, and sprinkle the parsley, oregano, and rosemary. Sprinkle some salt and pepper as per taste.
Drizzle some of the Italian vinaigrette on top and close the top half of the bread. Wrap the sandwich in butcher paper and slice it into two or four pieces. Your sandwich is ready to serve or eat immediately.