Despite its pronunciation, just deserts, with one s, is the proper spelling for the phrase meaning "the punishment that one deserves." The phrase is even older than dessert, using an older noun version of desert meaning "deserved reward or punishment," which is spelled like the arid land, but pronounced like the sweet treat.
Just Desserts is a favourite for naming businesses specialising in confectionaries.
Grammar & punctuation checked by Grammarly.com. Used British English spelling.
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