Once you find a table and settle down, a man with a tray will suddenly appear and rapidly plonk down multiple plates of the same custard pudding on the table. You have to decide how many of them you want to keep to eat. He then collects the rest, pile the plates back onto the tray and whisks them away to the next table.
Great sales tactic. Not that it is needed because I would happily queue for these - they are very good with an eggy richness and slightly burnt caramel aroma.