Moutarde blanche is a mustard plant lighter in color and flavor than the usual mustard plant. The seeds a lighter in color just like you can find white pepper corns and black pepper corns. It makes a lighter tasting mustard and I suggest you can only find it in France. As a substitute use a small amount of French Dijon (not grainy) - better yet is to mix it in a small amount of white sauce as described above, but you still want a mustard flavor, not a sauce flavor. Keep the extra in the fridge for a few days to use on a sandwich. Remember, Dijon made in USA is not real Dijon, just as "French's" mustard has nothing to do with France...or mustard !
That's an interesting question. I've been teaching French cooking and traveling in France for a very long time, and have never seen that phrase in a recipe, either in English or French.
Moutarde blanche is a common variety of mustard plant. Maybe your recipe is referring to mustard made with white wine or white vinegar. It would be helpful to know more about the recipe, but if only a small quantity of mustard is needed, I'm guessing that substituting smooth Dijon mustard would probably be fine.
I believe that moutarde blanche is referring to a white sauce that contains mustard. To your traditional white sauce you add some dijon mustard. I could be wrong but thats what I think it is.
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