Combine the ground pork and pork sausage, red pepper flakes, 2 cloves of the chopped garlic, panko, grated cheese, eggs, parsley, kosher salt and black pepper, to taste, in large bowl. Form into 2-inch-meatballs and set aside on a platter.
Heat 2 tablespoons of the olive oil in large skillet over medium-high heat. Add the meatballs and cook until brown on all sides. Transfer to plate.
Meanwhile, start the sauce. Add the 2 tablespoons of the remaining olive oil to a medium saucepan over medium heat. Add the onion, and the remaining garlic. Saute until the onion begins to brown, about 4 to 5 minutes. Season the onions with salt and pepper, to taste. Add the tomato puree and the tomatoes and bring to a boil. Reduce the heat, stir in the meatballs and simmer the sauce, stirring occasionally, for 45 minutes.
To serve, put a meat ball on the bottom of each roll and drizzle lightly with some sauce. Top with a basil leaf and some shaved pecorino. Cover with the roll tops and transfer to a platter. Serve warm.