Ingredients:
- 1 large red onion, peeled, cut into eight 1/4- to 1/2-inch-thick rounds
- 2 tablespoons extra-virgin olive oil, plus extra for drizzling
- 1/4 teaspoon kosher salt
- 1/4 teaspoon freshly ground black pepper
- 4 ciabatta rolls, halved horizontally
- 1 cup jarred tomato-basil sauce, such as Giada De Laurentiis for Target
- 1 teaspoon red pepper flakes, optional
- 1 1/3 cups arugula
- 12 Classic Italian Turkey Meatballs, recipe follows, halved
- 8 thin slices prosciutto, each about 6- by- 3-inches
- Eight 1/4-inch-thick slices provolone
- 1 cup plain breadcrumbs
- 1/2 cup finely grated Parmesan
- 1/4 cup chopped fresh basil
- 1/4 cup chopped fresh Italian parsley
- 1/4 cup whole milk, at room temperature
- 1 tablespoon tomato paste
- 3/4 teaspoon kosher salt
- 1/2 teaspoon freshly ground black pepper
- 2 large eggs, at room temperature
- 2 cloves garlic, minced
- 1 small onion, finely chopped
- 1 pound ground dark turkey meat
- 1 pound spicy Italian turkey sausage links, casings removed
- Extra-virgin olive oil, for drizzling
