Porchetta Street Sandwich

Name: Porchetta Street Sandwich
Prep time: 10 min
Cook time: 1 h 45 min
Total time: 1 h 55 min
Cuisine: American
Ingredients: 5 pounds pork belly, skin attached; 2 tablespoons kosher salt; 1 tablespoon black pepper; 3/4 cup fresh sage; 3/4 cup fresh rosemary; 3/4 cup fresh dill; 4 garlic cloves; 2 tablespoons olive oil; 2 tablespoons tomato paste; 4 celery stems; 1 large onion; 1 tablespoon olive oil; 1 glass wine; Porchetta drippings; 5 cups water; 1 pound pork bones; 1 tablespoon salt; 1/2 tablespoon black pepper; 1 pizza dough or store bought baguette; 4 slices smoked mozzarella; 1/2 cup sautéed rapini; 2 cups roasted porchetta; 1 cup dipping broth