The Collaborative International Dictionary of English v.0.48:

R'echauff'e \R['e]`chauf`f['e]"\, n. [F., orig. p.p. of
   r['e]chauffer 8warm over. See Chafe, v. t.]
   A dish of food that has been warmed again, hence, fig.,
   something made up from old material; a rehash.
   [Webster 1913 Suppl.]

         It is merely a r['e]chauff['e] of ancient philosophies.
                                                  --F. W. H.
                                                  Myers.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

rechauffe
    n 1: warmed leftovers