In a large mixing bowl, combine the sliced olives, diced provolone, salami, ham, mortadella, cherry tomatoes, pepperoncini, and red onion. Gently toss to combine.
If using optional ingredients like capers, roasted red peppers, parsley, or oregano, add them now and mix gently.
Add the torn lettuce to the bowl and gently fold it into the meat and olive mixture.
In a small separate bowl, whisk together the olive oil and red wine vinegar. Season with salt, pepper, and dried Italian herbs if using.
Drizzle the dressing over the salad and gently toss until all components are lightly coated.
Taste and adjust seasoning if needed, adding more salt, pepper, or vinegar as desired.
For best flavor, cover and refrigerate for 15-30 minutes before serving to allow flavors to meld together.