A few months ago I tried a Dijon mustard recipe from The Homemade Vegan Pantry. I thought I had used a white wine that was too dry. The mustard had a very bitter taste. I tried it again with a less dry white wine. I allowed it to sit longer hoping it would be mellower. Today I tested it and it was just as bitter as the first. I gave up on that recipe. I decided to try a different recipe. It was taken from the Homemade Condiment cookbook: the Spicy Brown Mustard. The ingredients: powdered yellow mustard, kosher salt, tumeric, paprika, water, white wine vinegar, and brown sugar to taste. I used a few drops of agave. I didn’t have white wine vinegar so I used white cooking wine. 
The result is a smooth, spicy mustard paste. It is usable now but I think I will let it mellow a bit. It has a little bitter tinge but nothing like the other recipe. I wonder what would happen if I used white wine vinegar?
Well, I am getting back in the lab. Happy cooking.
