FRENCH FOOD HISTORY: A popular condiment was born when Jean Naigeon of this city substituted the juice of unripe grapes for vinegar.
Answer What is Dijon?
Dijon mustard quickly became a popular ingredient after Jean Naigeon of Dijon, France, substituted verjuice, or the juice of unripe grapes, for vinegar. The staple was actually first used in 1336 for a feast held for King Philip VI, but it wasn't until Jean Naigeon's experiment that it gained widespread attention.
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