01 - In a medium bowl, blend mayonnaise, red wine vinegar, oregano, garlic powder, black pepper, red pepper flakes, and salt until homogenous.
02 - Add shredded iceberg lettuce and thinly sliced red onion to the dressing. Toss thoroughly to coat veggies evenly, then set aside.
03 - With a bread knife, slice each hoagie roll lengthwise, keeping one side intact to act as a hinge.
04 - Arrange 2 slices provolone cheese and 2 slices each of Genoa salami, deli ham, mortadella, and capicola on the bottom half of every roll.
05 - Lay several slices of tomato evenly over the meats in each sandwich.
06 - Generously spoon the prepared grinder salad mixture over the tomato and meats.
07 - Top with sliced pepperoncini, if desired, for added zest.
08 - Fold the rolls closed and apply gentle pressure to secure the layers. Serve the grinders immediately for best texture.