ca854cdc_oking_For_Engineers__June_2004__Definition
[Term] Zest [Definition] 
The aromatic outermost layer of skin on a citrus fruit. The white pith is not part of the zest. Can be removed from fruit with a paring knife, but is easiest removed by a Microplane Zester (or a woodworking rasp).
Cooking For Engineers: June 2004
Definition