1. Heat oil and butter in a skillet over medium-high heat and add onion, celery, and carrots.

2. Incorporate ground meat into vegetable mixture. Season with salt and pepper to taste.

3. Cook until meat browns and vegetables are tender.

4. Add puréed tomatoes coulis and nutmeg, if using, and simmer over low heat for 45 minutes.

5. About 15 minutes before the sauce is ready, cook pasta in another saucepan according to package directions.

6. Combine cooked pasta with the sauce and serve with freshly grated Parmesan.

Tip:
For milder flavour, add a dash of cream right before serving.