Learn how to say Just Deserts correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word deserts:
what a person deserves with regard to reward or (more usually) punishment:
the penal system fails to punish offenders in accordance with their deserts
get (or receive) one’s just deserts
receive what one deserves, especially appropriate punishment:
those who caused great torment to others rarely got their just deserts
Middle English: via Old French desert, from deservir ‘serve well’ (see deserve)
If a person gets their just deserts they get what they deserve. Deserts here is related to deserve, and is spelled with one -s- in the middle; a dessert is a sweet course eaten at the end of a meal. The -ss- spelling in the sense ‘what a person deserves’ is regarded as an error, although in the Oxford English Corpus it is almost as common as the correct spelling.