The only French mustard that has a legal certification (an "IGP", meaning "Certified Geographic Origin") is the "Moutarde de Bourgogne". It's made with wine whi

The only French mustard that has a legal certification (an "IGP", meaning "Certified Geographic Origin") is the "Moutarde de Bourgogne". It's made with wine while the Dijon mustard uses vinegar. And the latter (Dijon's recipe) imports most of the mustard seeds used in its mustard, while the "Moutarde de Bourgogne" has to use locally produced seeds. https://fr.wikipedia.org/wiki/Moutarde_de_Bourgogne https://fr.wikipedia.org/wiki/Moutarde_de_Bourgogne By the way, mustard was a very important condiment in France for many centuries. But out of the 8 French idioms listed in a 150 years old dictionary, only one is still used nowadays. https://www.littre.org/definition/moutarde https://www.littre.org/definition/moutarde