Into a pan with 3 tbsp of olive oil, add the pancetta and sauté until rendered.
Add the carrot, celery and onion to a food processor, and pulse until finely diced. Add that mixture to the pan with the pancetta. Sauté for a few minutes until translucent.
Add in the three types of meat and cook until browned and all the water has evaporated. Season with salt and pepper to taste.
Add in red wine and cook out the alcohol. **You'll know when the alcohol has cooked out when you don't smell alcohol anymore.**
Now add in your puréed tomatoes, stir to combine and season with salt and pepper to taste.
Optionally, you can add in the rind of Parmigiano. It adds amazing flavor!
Cover and bring this up to a boil, once boiling lower it down to low medium and let it simmer for at least 1 to 1 1/2 hours up to 2 hours, if time allows.
Serve with your favorite type of pasta. I usually serve this with either tagliatelle, rigatoni or long fusilli.