In a large mixing bowl, combine shredded iceberg lettuce, halved cherry tomatoes, thinly sliced cucumber, thinly sliced red onion, sliced roasted red peppers, and sliced pepperoncini. Toss well to mix the vegetables evenly.
In a small bowl or a jar with a lid, combine olive oil, apple cider vinegar, dried oregano, a pinch of salt, and freshly cracked black pepper. Whisk or shake until the mixture is well blended. For added heat, consider mixing in some crushed red pepper flakes to your taste.
Pour the dressing over the mixed vegetables in the bowl. Gently toss until all the vegetables are evenly coated with the dressing. Set aside to let the flavors meld.
Carefully slice the hoagie roll in half lengthwise, creating a top and bottom piece. On the bottom half, layer a generous handful of the dressed salad mixture to cover the entire base.
Place a layer of shredded provolone cheese atop the salad, followed by the thin slices of salami and capicola. You can add another small handful of the salad on top for extra balance before placing the top half of the hoagie roll back over the fillings.
Wrap the assembled sandwich tightly in parchment paper and allow it to rest for about 10 minutes.
Slice the sandwich diagonally for easy handling, and serve it with additional cherry tomatoes or pepperoncini on the side for an appealing garnish.
Notes
For added heat, consider mixing in some crushed red pepper flakes to your taste.