The Collaborative International Dictionary of English v.0.48:

Croustade \Crou`stade"\ (kr??`st?d"), n. [F., fr. cro?te a
   crust, OF. crouste.] (Cookery)
   Bread baked in a mold, and scooped out, to serve minces upon.
   --Bishop.
   [1913 Webster]