Mustard containing black or brown mustard seeds, verjus or white wine, plus vinegar, salt, and water, can be called 'Dijon,' explains Brandon Collins, mustard sommelier for Maille, a condiment ...
Here are some other substitutes for Dijon mustard that you can try. Yellow mustard is the obvious answer. Made from powdered yellow mustard seeds ... on the other hand, is tangier and spicier.