Family Style Italian Grinder Sandwich

1. Make the salad mix by combining iceberg lettuce, red onion, pepperoncini peppers, red wine vinegar, olive oil, 2 Tbsp. mayonnaise, oregano, kosher salt, black pepper, and red chili flakes in a bowl and toss to combine.
2. Cut the ciabatta bun in half lengthwise.
3. Spread mayonnaise on both cut halves of the bread.
4. Layer the Italian meats, sliced tomatoes, the prepared salad mix, and provolone cheese on the bottom half of the bread.
5. Place the top half of the bread on top.
6. Slice the large sandwich into smaller, individual portions and serve immediately.