My allergies prevent me from consuming yeast, alcoholic beverages and vinegar. I often substitute lemon juice for vinegar, but this does not always work. I'm trying to find an allergy-free recipe for homemade dijon mustard. Any suggestions?
Another allergy sufferer claims you can swap in pure vitamin C & water for the vinegar. It wouldn't be Dijon mustard, which strongly depends on the flavor of white wine, but it could be a strong, fine-grained mustard.
If the flavor isn't quite right, you can also experiment with citric acid crystals (sour salt), or a mix. For a bit more wine flavor, consider adding a small amount of white grape juice. Saba (concentrated unfermented grape must) would be even better, although it's difficult to find in some countries.
It's not going to be quite the same, but swap the wine for grape juice & swap the vinegar for non-brewed condiment
Grape juice is going to be sweeter than wine, so you might have to knock back the quantities a bit, but it's actually quite hard to tell non-brewed condiment from regular vinegar.