The secret to good spaghetti sauce is, in my opinion, cooking it very slowly and for a long time. Using a crock pot is the perfect solution! This sauce is great because of all the nutritious vegetables in it, and because it is versatile. I make it without the ground beef for meatless Fridays, with the beef at other times. We pour it over pasta, serve it with spaghetti squash in the fall, or spread it on pita bread to make "pita pizza." All quantities are approximate, so don't be afraid to play around with the ingredients a little.