I glanced at this recipe, modifing it for what I had on hand. Probably used 3 onions, 5 or 6 stalks of celery and a similar amount of carrot. I omitted the ham, used only 1 potato. In addition to thyme, I added a generous amount of parsley. I completely forgot I was supposed to use chicken broth - I simply cooked this in whater. At any rate, this is great! Very homey, and super low cal. I didn't even miss the chicken broth I completely forgot to add. Good soup with LOTS of potential for tweaks!