To thinly slice Chinese cabbage, wash it and place on a cutting board. Beginning at the green end, use a sharp knife to cut across the head, producing thin shreds.
To give cucumber slices a decorative scalloped edge, start with a whole, unpeeled cucumber. Use the tines of a fork to make lengthwise ridges from end to end of cucumber. Rotate the cucumber and keep marking it until the entire peel is scored. Cut and slice scored cucumber.
Assemble salad ingredients in serving bowl; cover with a damp paper towel and plastic wrap. Place dressing in jar with tight-fitting lid. Refrigerate salad and dressing separately. Just before serving, toss salad with dressing.