Grind the mustard seed to a fine consistency. Mix the ground mustard with the dry mustard powder and water in a small bowl, cover with plastic wrap, and set aside overnight. Combine the mustards with the wine, vinegar, salt, and turmeric in a blender or mini-food processor. Puree until smooth. The mustard should be ready to use immediately, with a refrigerator shelf life of 3 months.

very coarse stone-ground consistency, whisk the mustard mixture and the remaining ingredients together rather than pureeing.