zwieback

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The Word of the Day for September 24 is: 

zwieback   \SWEE-back\   noun
     : a usually sweetened bread enriched with eggs that is 
baked and then sliced and toasted until dry and crisp

Example sentence:
     Our favorite cheesecake recipe calls for finely crushed 
zwieback crumbs for the crust.

Did you know? 
     In ages past, keeping food fresh for any length of time 
required a lot of ingenuity, especially when one needed to carry 
comestibles on a long journey. One of the solutions people came 
up with for keeping bread edible for traveling was to bake it 
twice, thereby drying it and slowing the spoiling process. The 
etymology of "zwieback" reflects this baker's trick; it was 
borrowed from a German word that literally means "twice baked."