that recipe does sound good though i'm not sure why it's got the spaghetti sauce in it - it'd defitely make it a little heartier and a thicker - i've usually just used chicken stock or vegetable stick... and garlic - must have a few cloves of garlic
the only real suggested i'd make to the recipe is cook the onion, garlic, and celery in the pot for a few minutes before adding the rest of the ingredients..
and serve with some grated parmesan cheese on top...
Deliciousness..