01 - Heat olive oil in a large skillet over medium heat. Add pancetta, onion, carrots, and celery; sauté for 5 to 7 minutes until softened.
02 - Stir in minced garlic and cook for 1 minute until fragrant.
03 - Add ground beef (and pork if using), breaking it apart with a spoon. Cook until no longer pink, about 5 minutes.
04 - Move the sautéed mixture into a slow cooker to continue preparation.
05 - Add crushed tomatoes, tomato paste, red wine, broth, oregano, basil, bay leaf, red pepper flakes, salt, and pepper to the slow cooker. Stir thoroughly.
06 - Cover and cook on LOW for 6 to 8 hours or on HIGH for 3 to 4 hours until thickened and flavorful.
07 - Remove the bay leaf. Adjust seasoning with salt and pepper as needed.
08 - Serve the sauce hot over pasta, garnished with freshly chopped parsley or basil.