Slow Cooker Sweet and Sour Cabbage and Beef Soup

This is serious comfort food.  As it was cooking, the smell reminded me of the famous sarmale (Romanian sour cabbage rolls).  The taste is not too far from that either.  This is absolutely delicious and quite hearty.  If you want to you can serve it with a dollop of sour cream or just as is.  It's VERY good!  Enjoy!
-1 lb extra lean or lean ground beef
-1 small head cabbage, roughly chopped
-3 cups chicken broth
-1 small onion, finely diced or 2 Tbs dehydrated onion
-1 (14.5 oz) can petite diced tomatoes, undrained
-3 Tbs tomato paste
-1 1/2 tsp salt
-1 tsp pepper
-3 Tbs balsamic vinegar
-2 Tbs packed brown sugar
-plain yogurt or sour cream to garnish, if desired
Brown the beef, drain and place in slow cooker.  Add remaining ingredients, except yogurt/sour cream.  Give it a good stir, cover and cook for 6-7 hours on low.
Ladle into bowls, top with yogurt/sour cream, if desired and enjoy!