• 2 tablespoons unsalted butter
• ½ small onion, diced
• 2 cloves garlic, minced
• ¼ cup dry red wine
• 1 (28-ounce) can crushed tomatoes
• 1 (15-ounce) can petite diced tomatoes
• 1 teaspoon Italian seasoning
• Kosher salt and freshly ground black pepper, to taste

For the meatballs:

• 1 pound lean ground beef
• 1 pound Italian sausage, casing removed
• ½ small onion, grated
• ½ cup Panko*
• ¼ cup whole milk
• 1 large egg
• ¼ cup freshly grated Parmesan
• ¼ cup chopped fresh parsley leaves
• 2 cloves garlic, minced
• 2 tablespoons chopped fresh basil
• Kosher salt and freshly ground black pepper, to taste