This Dec. 1, 2014 photo shows slow cooker onion soup in Concord, N.H. The humble onion is one the most common aromatic vegetables, popping up in so many ways across so many cuisines. (AP Photo/Matthew Mead)

The genesis of onion soup is unclear, but some attribute the version we know today to a French king. Even in modern France, onion soup is slurped up by late-night revelers taking a break in the party to revitalize their bodies with warm oniony broth before continuing the fete into the morning hours.


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