Prepare the Rolls. Slice the sub rolls lengthwise without cutting all the way through. If you like, scoop out a little of the soft interior to make room for the fillings.
Mix the Dressing. In a small bowl, stir together olive oil, red wine vinegar, Italian seasoning, salt, and black pepper. This quick dressing adds that classic deli-style flavor.
Layer the Meats and Cheese. Open the rolls and layer the salami, ham, pepperoni or capicola, and provolone cheese evenly inside each one.
Add the Toppings. Top the meat and cheese with shredded lettuce, sliced tomatoes, red onion, and pepperoncini.
Dress and Serve. Drizzle the dressing over the sandwich fillings. Add a thin layer of mayonnaise if desired, then close the sandwiches, press gently, and serve immediately.