Soups in Onion soup?

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I'm confused by the section which says onion soup is a surviver of the custom of making thick stew and pouring it on bread. The only onion soup I have ever seen or eaten has been a thin, clear soup.

_; you poor dear. The finer cafés that are so common around the world usually serve onion soup in the form of a thick, cheesy soup that is very filling. Of course, this is the French version of it, whose name I have forgotten; however, I understand there is a "poor man's" version of it that may be what you have been treated