Make Ahead Tip: Cover and refrigerate the sauce (Step 1) for up to 1 week; wash and dry watercress up to 4 hours ahead.
Shao Hsing (or Shaoxing) is a seasoned rice wine. It is available in most Asian specialty markets and some larger supermarkets in the Asian section. If unavailable, dry sherry is an acceptable substitute.
2 vegetable, 1 1/2 fat