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Hadn't even noticed the food thing, it's not about food! Less an inside joke and more a cultural reference really, but if you don't know it you don't know it. Reading up on the landlord of a well known fictional pub would be a good starting point.
The picture's not as wide as I remembered I'm afraid, so probably not very helpful. But once you have the real name of the landlord and the clues in this thread already Google is your friend...
Hah. No. Would a wider shot be helpful?