Heat 3 tbsp. olive oil in a large pan, add in the chopped onions & saute until translucent, then add in the chopped carrots & celery. Cook 3-4 minutes, stirring the veggies from time to time. Transfer to a 6-quart slow cooker bowl.
Add in the remaining ingredients (the ground beef, heavy cream, plum tomatoes, dry wine, the whole nutmeg, ground black pepper & salt). Cover and cook on " low" for 6-7 hours, or "high" for 5-6 hours.
Toss with the cooked drained pasta, adding a tablespoon of olive oil.
Serve with freshly grated Parmesan cheese.