Les Chef's French Onion soup is both very good and kind of "meh" at the same time. The broth, cheese, and bread have very good flavor. The onions, on the other hand, could have stood to be more cooked both times I've had it. I'm used to French Onion soup where the onions are caramelized before being added to the broth. The ones at Les Chefs are not caramelized first; it's more like they're medium sliced (about 1/2-inch thick) and then tossed in the broth to cook (i.e., be boiled).
Like OrangeCountyCommunter, I thought beef broth was the more authentic/common stock used for French Onion Soup, whereas vegetable broth is the method to make it vegetarian.