A rustic Italian loaf called a cucolo makes an impressive large sandwich that serves a crowd. For the filling, olive tapenade is added to the classic Italian combination of fresh mozzarella, tomatoes, and basil known as "Caprese."
Slice cucolo crosswise into 2 rounds. Spread both rounds with tapenade. Arrange slices of mozzarella, basil, and tomato on the bottom half. Drizzle with olive oil; season with salt and pepper. Top with the remaining half loaf.
If you use a round loaf other than cucolo, you may need to scoop out some of the insides of the bread so the sandwich isn't too thick. Save the scooped-out bread for bread crumbs.