1. Slice the bread horizontally and lay each half, cut side up, on a work surface. Drizzle with olive oil. On one half, lay down the prosciutto to cover. Repeat with the salami and mozzarella. Top with the pepper, oregano, and sun-dried tomatoes. Cover with the other half of the bread.

2. Press down on the sandwich and wrap tightly in plastic wrap and then foil. Press under heavy saucepans or cans for up to overnight in the refrigerator. When ready to eat or pack, unwrap the loaf, cut into servings, and serve, or rewrap and pack.