My Grey Poupon smells very eggy.

[JRootabega]

It’s their Dijon mustard. Right after the bottle was opened, unmixed, there was a sulfurous eggy smell and taste. It’s not overpowering, but it’s noticeable. Eggs aren’t listed in the ingredients:
Water
Vinegar
Mustard Seed
Salt
White Wine
Fruit Pectin
Citric Acid
Tartaric Acid
Sugar
Spice
Now that I looked I see that it says to shake before using. I’ve never done this and this is the first time I’ve smelled it this strong.

What the dillyo?

[Squink]

Like eggs, mustard contains sulphur compounds which, when hydrolyzed, produce Hydrogen sulphide; the smell of overcooked eggs. The sulphur containing chemicals are to a large part responsible for the flavor of mustard. All about mustard.