zest zest /ˈzɛst/

noun

1. () Vigorous and enthusiastic enjoyment  ( zestfulness , gusto , zest , relish )
   vigorous and enthusiastic enjoyment
     He licked his lips in anticipation, savoring the relish on the juicy burger.
   He licked his lips in anticipation, savoring the relish on the juicy burger.
   
2. A tart spicy quality  ( nip , piquance , piquancy , piquantness , tang , tanginess , zest )
   a tart spicy quality
   
   

verb

1. (cooking) add herbs or spices to  ( spice , zest , spice up )
   (cooking) add herbs or spices to