Prepare the vegetables by rinsing and slicing the iceberg lettuce, red onion, tomato, and pepperoncini into bite-sized pieces.

Make the dressing by whisking together mayonnaise, red wine vinegar, olive oil, oregano, garlic powder, salt, and pepper until smooth.

Toss the prepared vegetables in the dressing until evenly coated.

Preheat the broiler and spread butter or drizzle olive oil on the roll halves. Toast under the broiler for 2-3 minutes.

Layer provolone cheese on the toasted roll halves and return to the broiler for 1-2 minutes until melted.

Layer the Genoa salami, deli ham, and optional pepperoni on top of the melted cheese.

Season tomato slices with salt and pepper, then place them on top of the meats.

Top with the dressed salad mixture generously.

Fold the roll over the fillings and let rest for 3-5 minutes.

Slice the sandwich diagonally for serving.