Combine pork and beef in a bowl. Season lightly with salt and pepper. Set aside while preparing the aromatics.
Heat olive oil in a large pot over medium heat. Add the onions and cook until golden and translucent, about 7–10 minutes.
Stir in the diced carrots and celery. Cook for another 5–7 minutes until softened. Add minced garlic and cook for 1–2 minutes, stirring constantly, until fragrant.
Add the pork and beef to the pot. Break it apart with a wooden spoon and cook for about 10 minutes, letting it brown and caramelize slightly for deeper flavor.
Pour in the red wine, scraping up any browned bits from the bottom of the pot. Let the wine simmer for 3–4 minutes to reduce slightly.
Stir in passata and tomato paste until well combined. Add bay leaves, then season with salt and black pepper. If needed, add a pinch of sugar to balance acidity or nutmeg for warmth.
Lower the heat and partially cover the pot. Simmer the ragu for 2–3 hours, stirring occasionally. Add water or stock if it becomes too thick.
Before adding pasta, divide the ragu if desired. Save half in an airtight container for another meal, such as lasagna.
Boil pasta for 1–2 minutes less than package instructions says. Add the undercooked pasta to the ragu and toss over medium heat for 2 minutes. Add a splash of pasta water if needed to adjust consistency. Serve hot, garnished with fresh parsley or basil and grated Parmesan.