Step 1: Cook the Pasta

1. Bring a large pot of salted water to a boil.
2. Cook the rigatoni until al dente, following the package instructions (typically 10-12 minutes).
3. Reserve ½ cup of pasta water, then drain and set aside.

Step 2: Cook the Meat

4. Heat olive oil and butter in a large pan over medium heat.
5. Add diced onions and cook until soft and translucent (about 3 minutes).
6. Stir in minced garlic and cook for 30 seconds until fragrant.
7. Add ground beef and sausage, breaking it apart with a wooden spoon.
8. Cook until browned and fully cooked (about 5-7 minutes). Drain excess fat if needed.

Step 3: Build the Sauce

9. Stir in tomato paste and cook for 1 minute to enhance its flavor.
10. Lower the heat and slowly pour in heavy cream, stirring constantly.
11. Let the sauce simmer for 3-4 minutes until it thickens slightly.

Step 4: Combine Everything

12. Stir in grated Parmesan cheese, salt, black pepper, and nutmeg.
13. Add the cooked rigatoni directly to the pan, tossing it in the sauce.
14. If needed, add a splash of reserved pasta water for a smoother consistency.

Step 5: Final Touches & Serving

15. Let the pasta sit for a minute to absorb the flavors.
16. Garnish with chopped parsley and extra Parmesan before serving.