Preheat the grill to medium high heat. I kept mine between 350 and 400 degrees.

Slice the loaf of bread into an even number of sandwich sized slices, slicing most but not all the way through, so that the loaf is still intact. I was able to get 12 slices out of mine.

Divide the loaf into sandwiches. Pull apart the center of each sandwich and brush it with olive oil and vinegar, then sprinkle with oregano. Stuff the middle of each sandwich with an even amount of ham, salami, pepperoni, banana peppers, onion, and cheese slices. Wrap the sandwich in foil. At this point, you can refrigerate until you're ready to eat, or place the sandwich on the hot grill and grill for 10-12 minutes, or until cheese is melted and meats are starting to crisp on the edges.

Carefully unwrap the loaf and use a knife to separate into 6 individual sandwiches. Finish with sliced tomato, lettuce, and the remaining olive oil and vinegar drizzled on top. Sprinkle with salt and pepper and serve.