Prepare pancetta: Finely mince the pancetta using a food processor or knife until it almost disappears to blend into the sauce.
Cook pancetta and soffritto: In a large pot over medium-low heat, add 2 tablespoons of extra virgin olive oil and the minced pancetta. Cook gently to sweat the pancetta and release fat. Add chopped brown onion, celery, and carrots. Cover with lid and cook for about 10 minutes, stirring every 2 minutes to avoid burning, until vegetables are tender and glossy.
Add wine to soffritto: Add a splash of red wine to the soffritto, mix, cover again, and cook for 2 more minutes to tenderize and develop flavor.
Cook the meat: Add a little extra virgin olive oil, then add the ground pork and beef to the pot. Break the meat up with a wooden spoon and cook until it just changes color to grey, not fully cooked.
Add remaining wine and simmer: Pour in the remaining wine, mix well, and let it simmer for about 10 minutes until the alcohol evaporates and flavors meld.
Add tomato paste and tomatoes: Season with generous salt and pepper. Stir in the tomato paste thoroughly, then add the passata and peeled tomatoes. Mix well.
Long slow cook with lid: Cover the pot with a lid and cook on low heat for 3 hours. Stir every 30 minutes to prevent sticking.
Cook uncovered to thicken: Remove the lid and cook for an additional 1 hour uncovered on very low heat. Stir frequently to avoid burning and adjust seasoning with salt and pepper.
Optional milk addition: For a silkier, creamier sauce, add a splash of full cream milk and cook for another 5 minutes without stirring.
Serve: Serve the sauce with freshly cooked pasta such as tagliatelle or pappardelle. Garnish with grated Parmesan cheese if desired.
Storage: Portion leftover sauce into containers and freeze for future use.