From Ming Tsai's Simply Ming. If you cannot find Chinese Black Vinegar, use Balsamic. This works beautifully on everyday tossed greens and other impromptu salad combinations or as a marinade for poultry, meat, and fish.
In a blender or food processor, combine the mustard, shallots, vinegars, soy sauce, and sugar and purée.
With the machine running, slowly drizzle in the oil until an emulsion is formed.
Season with salt and pepper, remembering that not much salt will be needed because of the soy sauce.
Use or store. Lasts 2 weeks, refrigerated.
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