For a long time I've been curious about this ugly root veggie, and when I saw it at the market yesterday I decided it was time to experiment with it. My plan is to put up a big pot of chicken soup today, and although I have a sense that celeriac will enhance it, I don't quite know how to include it. I generally cook my soup with celery, onions, carrots and parsnips. Does the celeriac take the place of celery, or is it used in addition to celery? Also, do I use the celery-like greens that are attached at the top, or do I use only the bulb? What else do I need to know about celeriac? Thanks!