3 large eggs, lightly beaten
1 pound ground beef
1 pound spicy Italian sausage, casings removed
1 medium onion, grated
3 cloves garlic, finely chopped
1/2 cup Italian breadcrumbs
2 teaspoons Italian seasoning
2 teaspoons ground black pepper
1/2 cup store-bought or homemade pesto
2 roasted red peppers, blotted dry and cut into small pieces (from a 12 ounce jar; about 1 cup chopped)
20 basil leaves
8 ounces shredded mozzarella
6 ounces thinly-sliced prosciutto