Prepare the salad ingredients. Shred the iceberg lettuce into thin strips. Thinly slice the red onion. Finely chop the pepperoncini pepper. Finely mince or grate the garlic clove.
In a medium sized bowl combine the mayonnaise, red wine vinegar, parmesan cheese, Italian seasoning, oregano, chili flakes (if using). Mix until evenly combined.
Add the lettuce, red onion, pepperoncini and garlic. Toss until evenly coated. Taste and season with salt and pepper as desired.
Set aside in the fridge while you assemble the sandwich.
Slice each hoagie or submarine bun through the centre and place on a sheet pan cut sides up.
Place 3 slices of provolone cheese on the top half of each bun. Evenly distribute and layer the deli meat on the bottom halves.
Place the sheet pan in the oven or toaster oven on ‘broil’ for 2-3 minutes, or until the cheese has melted (or air fry on 400°F for 2-3 minutes).
Slice the tomato into thin slices and layer on top of the deli meat.
Top with the grinder salad and sprinkle on the grated parmesan cheese.