In the last supper painting why is there no supper on the table?

It's one of the most recognisable paintings in the world but no one seems to spot there no actual supper. Most of the plates are empty and clean, no ones actually eating. But there's wine, so was it really just a drinking session witha packet of crisps?
In the last supper painting why is there no supper on the table?
In the last supper painting why is there no supper on the table?
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