zest >> zɛst
Definition: [noun] great enthusiasm and energy.
Example: they campaigned with zest and intelligence
Definition: [noun] the outer coloured part of the peel of citrus fruit, used as flavouring.
Example: add 3 tablespoons of lemon zest
Definition: [verb] scrape off the outer coloured part of the peel of (a piece of citrus fruit) for use as flavouring.
Example: zest the orange and lemon, taking care to discard all of the white pith