Literally “shall I serve you everything?” Can be used to imply a hint of gluttony
The British Rail breakfast was served from a massive salver: eggs, bacon, sausages, fried bread and so on. The customary way for the steward to announce his arrival at your table was “All the way round, sir?” (at least it was on the New Street → Euston service)
Mark – 1980s
Mark Iliff – owner
In ironic usage, the “sir” is obligatory regardless of pronoun preferences