Sweet and Sour Meatballs

Name: Sweet and Sour Meatballs
Ingredients: 1 cup grated Parmesan; 1/2 cup milk; 1 teaspoon granulated garlic; 1 teaspoon granulated onion; 2 slices brioche bread, torn into small pieces; 1 large egg; 1 pound 80/20 ground beef; 1 pound ground pork; 1 tablespoon shaved fresh chives; 1 tablespoon chopped fresh parsley; 1/2 teaspoon freshly ground black pepper; 1/2 teaspoon freshly ground white pepper; Kosher salt; Neutral oil, for frying; 4 tablespoons neutral oil; 1 small red onion, small dice; 5 cloves garlic, smashed; 1 cup light brown sugar; 1 tablespoon freshly ground black pepper; 1/2 teaspoon ground allspice; 1/2 teaspoon ground clove; 1/4 cup rum; 2 cups ketchup; 1/2 cup pineapple juice; 1/2 cup molasses; 1/2 cup yellow mustard; 1/2 cup cider vinegar; 1/4 cup white vinegar; 2 tablespoons chopped Calabrian chile; 2 teaspoons hot sauce, such as Tabasco