Crossword Genius

Asian dish from South, double up (4)

Ross

I believe the answer is:

pupu

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'asian dish from south double' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'up' is the wordplay.
I cannot really understand how this works, but
'up' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Hindu.
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