Dish is almost an archaic term a this point. So either someone's pretty old grandparents are working for MT, or people are translating a term from another language using an old dictionary.
It is colonial (British) English. I heard it again recently and it took me a few moments before I recalled it from my childhood. Apparently now "snack" is used the same way.
I would guess the classifiers went to school in India or Pakistan.
Sincerely, a Malaysian Chinese who’s seeing this slang for the first time.