1) Cheese rolls. I'm told these are more of a regional South Island thing (and more specifically, an Otago/Southland thing) than a NZ thing. White bread, cheese, and french onion soup mix rolled up into little pinwheels and grilled or baked until the bread is toasty and cheese/soup mix combo gets all gooey. What's not to love?
2) Beets. Kiwis LOVE beets. Except they call it beetroot. And then they put it on all of your sandwiches. And it makes your bread turn pink. I was picking it off of a sandwich the other day and a friend commented, "Americans aren't into beetroot, huh?" I confirmed this was correct. She responded, "But you still put it on burgers, right?"
3) Lemonade. Order this in a restaurant and they will bring you Sprite, 7-up, or a similar fizzy lemon-lime beverage. If you want lemon juice with water and sugar, you'd probably better make it yourself.
4) Pavlova. I've mentioned this before, but no list of Kiwi culinary quirks would be complete without it. It's a meringue desert, usually topped with fruit. It's good.
Whenever a Kiwi talks to me about pavlova (which happens more than you would think) they always make a big point to note that it originated in New Zealand, and that Australians have merely stolen the idea and claimed it as their own and are a bunch of damned liars. It appears to be a sensitive issue.
5) Sweet chili sauce. You don't really need to worry about this. Just avoid it at all costs.
6) Marmite. You don't really need to worry about this. Just avoid it at all costs.
7) Vegemite. In fairness, I haven't actually tried this, but after my Marmite experience I am avoiding it at all costs. My more adventurous readers can probably find it in the larger North American grocery stores if anyone wants to give it a go and report back. Go ahead. I dare you.