Best Spaghetti Sauce?

Do you have a favorite recipe you use? A favorite can or jar sauce that you use or add to?

I normally start with a jar sauce and add veggies, meat and seasonings but it’s hard to find the right one to use as a base. Most of the time I brown the meat and cook the veggies until they’re almost done, then I throw it all together with the sauce and seasonings in the crock pot and let it cook for several hours.

Any suggestions?