...VGML...
My apologies, someone just told me that you might mean Vegan and not Vegetarian. In which case the vegetarian onboard option may not be acceptable, as IME they can often have milk based products in them. (But as they are plated onboard, the CS may be able to plate a meal without, for example, cheese on it.)At least one of the two main meal options onboard a B737 Business Class flight will be vegetarian.
However, as AKL-RAR is a longer flight, it could have fresh/perishable pantry onboard in Business, so you should be able to ask for a fruit platter, if they have loaded it.