This is a nice twist on classic French onion soup, with the lovely addition of celeriac. Topped with toasted baguette and a generous sprinkling of grated cheese, then grilled till golden and bubbling, this makes a fab lunch or impressive starter.
Recipe submitter popping in to say, fresh fennel would change the flavor quite a bit but would probably be a great addition. Might add to immune boosting too, same with anything in the onion/garlic family. Celery root is a big round ugly lumpy beige root, usually about the size of a grapefruit. It's a specialty veg, might have to ask your store to order. Can be kind of expensive -- I usually only buy it for holidays -- but it's a nice addition to soups and mashes. - 12 May 2005 (Review from Allrecipes US | Canada)
This was good. Well seasoned. Unfortunately, I made a special trip to a grocery store 20 minutes away to buy celeriac and when I got home I found out it was fennel. Oh well. I was disappointed but made due. I just chopped some celery fine and added it with the onions. I don't know what celeriac would add to this soup because it was good without it. This was not too salty, not too winey, just right. You'll have to cook the onions a long time to get them right (about a half hour) but that's important. The roasted garlic butter was a great touch. - 08 Aug 2004 (Review from Allrecipes US | Canada)
I love this soup and the celeriac really makes it something different! I use only beef broth and put fresh parsley in. I also cut the onions into long thin strips before sauteing which gives the soup a great texture! This has become my standard soup to make when someone's sick, since the garlic (I put a whole head in) and onions make great immune boosters! - 22 Jan 2005 (Review from Allrecipes US | Canada)