She calls it 'maggie' but doesn't really know the real name of it. It has a bit of a celery smell to it but it is not celeriac.
In Poland "maggie" seasoning where
lubczyk is its main herb , is known to be added to "rosół" by some people but not while cooking it, only when you need to season your soup just before or while eating.
You can add
lubczyk herb (not
maggi) while cooking
rosół, adding it together with vegetables.
Personally, I would use only chicken, carrot, leek, onion, celery leaves and when cooked season it with fresh parsley leaves and salt&pepper.
What's important for me, I would add 1tbsp or a bit more of
Vegeta "Gourmet Stock" at the end of cooking (suprisingly not
Vegeta chicken stock).
Maggi seasoning I don't use because it changes
rosół flavour.
Some people add to
rosół cabbage?? beef meat??? and many other "magical" (for them) stuff , I don't know why.
Rosół is a very simple to cook without making it half "kapuśniak" (cabbage soup) or half "zupa wołowa" (beef soup).