I made this using leftover beef stock from French Dip Roast Beef for the Crock Pot and it turned out very nice. I omitted the salt as my broth was salty enough. The next time I make this, I may omit the Dijon mustard as I found it a strong taste for this soup. I did add a tbsp of worcestershire sauce too. (As mentioned by another reviewer, I did add noodles to the kids bowls too.). Thanks for sharing this.
I was getting ready to post this very recipe from "The Big Book of Soups & Stews". In a word this soup is awesome. I did not have mushrooms or parsley but otherwise followed the recipe to a "t". Even my kids loved it. I added noodles to their broth. Update: I am making this again today for dinner 5/3/08. It occurred to me that I used beef stew meat (cut into small pieces) last time and will use is once again today. I'm also going to saute the meat and throw it all into a crock pot and simmer all day long.
My husband is a fan of French Onion Soup but I always thought it needed meat. This soup was a win-win for both of our tastes. I omitted the mushrooms (by accident) and added a few dashes of worstershire sauce. It was great and was soothing to our colds!