Haver cake

from The Collaborative International Dictionary of English v.0.48

Haver \Hav"er\, n. [D. haver; akin to G. haber.]
   The oat; oats. [Prov. Eng. & Scot.]
   [1913 Webster]

   {Haver bread}, oaten bread.

   {Haver cake}, oaten cake. --Piers Plowman.

   {Haver grass}, the wild oat.

   {Haver meal}, oatmeal.
      [1913 Webster]