An invariable disappointment to those who expect the standard Chinese restaurant mustard sauce—an acrid blend of dry mustard and water—this is a silky sauce lush with the flavors of dark sesame oil and Dijon mustard. It will keep forever in the refrigerator.
Whisk all of the ingredients together until well blended. Store, refrigerated, in an impeccably clean glass jar. If the sauce separates, simply whisk it to emulsify.
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