Selecting mustard sauce, you can judge by the appearance of good and bad. If the paste is natural, no impurities, only small particles or fibers exist, and the color and lustre of the oil bright color uniformity, that means it is a good mustard sauce. Wang Zhihe is quite good when judged by its appearance, and then it tastes good too. Delicate taste, pungent odor is prominent, fried vegetables, stewed vegetables or cold mix when put some, are a good choice.