Super Skinny Vegetable Soup

This soup is almost zero calories per serving!  It's just a bunch of veggies cooked together in broth, which is very low in fat.  If you want to make it truly vegetarian, then swap the beef broth with vegetable broth.  Either way, this soup is a delight and is very filling too.  Delicious!  Enjoy!
-1 onion, finely diced
-2 garlic cloves, finely minced
-1 carrot, grated 
-4 cups beef broth (or vegetable broth)
-1 Tbs tomato paste
-1/2 small cabbage, roughly chopped
-1/2 cup frozen or fresh green beans
-1/2 tsp oregano
-1 tsp salt
-1 tsp pepper
-1 small zucchini, chopped
Coat a pot with cooking spray.  Add the onion, garlic and carrot and saute for 5 minutes.  Add the broth, tomato paste, cabbage, beans, oregano, salt and pepper.  Give it a good stir and let it simmer for 10 minutes.  Add the zucchini and simmer for 5 more minutes.  Ladle into bowls and enjoy!