I found three nearby Pacific Islander restaurants. One is Tongan, one is Samoan, and one is Indian Fijian. And in my research, I found this BBC series that's on YouTube called Cooking In the Danger Zone.
Here is the episode that covers Fiji and Tonga. I learned that the typical canned corned beef in Britain has 10% fat. The canned corned beef sold in Tonga has 25% fat. New Zealanders won't eat the fatty belly of mutton, so it is sold as cheap meat in Tonga. It was such an unhealthy food, Fiji banned its import.
I can buy this canned corned beef in the Fijian market next door to the Fijian restaurant. Do these brands look familiar to you New Zealanders and Australians?