Source : Webster's Revised Unabridged Dictionary (1913)

Vol-au-vent \Vol`-au`-vent"\, n. [F.] (Cookery)
   A light puff paste, with a raised border, filled, after
   baking, usually with a ragout of fowl, game, or fish.

Source : WordNet®

vol-au-vent
     n : puff paste shell filled with a savory meat mixture usually
         with a sauce