Chinese "Duck Sauce" (1951)

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   Could it be this recent?
   "Duck sauce" (Chinese-American "duck sauce," not your average sauce for ducks and not sauce made of ducks) is not in OED or Merriam-Webster.  This is the earliest hit on NEW YORK TIMES full text.  Notice that "duck sauce" had to be explained.


   21 January 1951, NEW YORK TIMES, "Chinese Pork Dishes," pg. 158:
   Serve hot and crisp as an appetizer with mustard and duck sauce (a bottled, sweet sauce from China, also sold in Chinatown).