Unfortunately once you put it in your roux you can't take it out. You might think about adding a more neutral ingredient like sautéed mushrooms to help balance it. And as a total apostate I might try sliced okra which matches well with a sharp mustardy flavor.
Try adding a bit of a really strong cheese to cover up the flavor—or did the recipe call for a cream or whole milk? You may be able to add that to reduce the mustard flavor. If you're able to send the recipe, I can take a look at it and see if I can help more!
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