How to Make It
Stir together first 3 ingredients; sauté, in batches, in 2 Tbsp. hot oil in a large skillet over medium-high heat 10 minutes. Transfer to an 8-qt. slow cooker.
Sauté sausage in remaining 1 Tbsp. hot oil in skillet 6 minutes or until no longer pink. Transfer to slow cooker, reserving drippings in skillet.
Sauté pancetta in hot drippings in skillet over medium heat 7 minutes or until crisp. Add onion, carrots, and garlic; sauté 5 minutes or until tender. Increase heat to high; add wine. Bring to a boil, stirring to loosen browned bits. Cook, stirring constantly, 5 minutes or until reduced by half.
Add tomatoes and tomato puree; bring to a boil. Transfer to slow cooker; add thyme and next 3 ingredients. Cover; cook on HIGH 1 hour. Reduce to LOW; cook 7 hours. Discard herbs; serve sauce over hot cooked pasta.