<<Disclaimer: Verify this information before applying it to your situation.>>

I looked in my CSA gluten-free products listing for gf mustard.  It
listed Best Foods Dijonnaisse Mustard as gf but when I read the
ingredient label on the bottle I saw it lists vinager- but not the
source of the vinager.  I emailed BestFoods to verify but they have yet
to respond. Can anyone verify that this is really gf?  If so what is the
source?
Thanks
Maria