The Collaborative International Dictionary of English v.0.48:

Biffin \Bif"fin\, n. [Cf. Beaufin.]
   1. A sort of apple peculiar to Norfolk, Eng.

   Note: [Sometimes called beaufin; but properly beefin (it is
         said), from its resemblance to raw beef.] --Wright.
         [1913 Webster]

   2. A baked apple pressed down into a flat, round cake; a
      dried apple. --Dickens.
      [1913 Webster]