World's Best Bolognesi Pasta Sauce

In a heavy saucepan(8 qt preferred, 6 qt in a pinch), heat olive oil and butter over medium heat. Add onion, celery,carrots, and garlic til vegetables are translucent. Add beef, pork, sausage and pancetta and brown over high heat for 10-15 minutes. Reduce heat to low medium, and add tomatoes, tomato paste, wine, beef stock and chicken stock. When sauce boils, reduce to a simmer. Simmer for about 3 hours ( no lid). Season with salt and pepper. Sauce can be cooled and frozen ( in 1/3 batch per container, for 1 lb pasta each). If entire batch is served, bring to a simmer, add 1 cup extra heavy whipping cream and simmer for an additional 10 minutes, then serve over your favorite pasta. For 1/3 batch containers, thaw and bring to a simmer. Add 2-3 oz of extra heavy whipping cream and simmer for 10 minutes, then serve with your favorite pasta.