[tlhIngan Hol] naH in fruit names 'oQqar in vegetable names

[mayqel qunen'oS]

'epIl naH
ghIrep naH
Sutra'ber naH

but..

tera' na'ran
tera' na'ran'a'
tanje'rIn

and..

'anyan 'oQqar
gharlIq 'oQqar

andl let's not forget

tlhagh patat 'oQqar naQHom

With regards to the fruits, I can't understand the rationale by which
some fruits have the {naH} and some don't. Does this mean that while
we can say {tanje'rInmey Soppu' qeSHoS}, we can't just say {'epIlmey
Soppu' qeSHoS} ? Do we *need* to add the {naH} too, thus writing
{'epIl naHmey Soppu' qeSHoS} ?

Similarly, if we want to say "the chef put french fries next to the steak".

Can't we just say {Ha'DIbaH baylaD retlhDaq tlhagh patat naQHommey
lanpu' vutwI'} ? Do we *need* to add the {'oQqar} too, thus writing
{Ha'DIbaH baylaD retlhDaq tlhagh patat 'oQqar naQHommey lanpu' vutwI'}
?

~ Qa'yIn