Mogsmaw, do you live in Britain? What Elaine1 has written means to any native English speaker, regardless of ethnicity. 'we went to a fish and chip shop this evening and bought a large portion of fish and chips, took it home where we divided it into 2 portions and each of us ate half.'
Or as Elaine1 says 'Paid £9 for large fish and chips tonight which did both of us.' which means exactly the same thing but is more succinct.
It is something lots of us do, especially us oldies as a large prtion of fish and chips is more than enough for two and cheaper than 2 small portions,