Good vegetarian matzo-ball soup recipe without using the packaged soup-mix?

I am veggie, so no chicken broth…I have always used the manischewitz mix, but it is so high in sodium (and I think also has msg). Is it possible to get that same yummy flavor another way?
I usually start by sauteeing carrots, celery, onions in oil, then add water and fresh dill, then add the flavor packet. Anyone have an alternate way of doing it?