From left to right: REALLY yellow (almost orange) egg yolks, silverbeet, and carrots.
In the Canterbury Plains the soil is considered "A1". This means it is very rich and nutritive. It was formed from rivers bringing soils from the mountains to the plains over long periods of time. Seems like a seed just touches the soil here and grows. Because the soil is so good, the vegetables grown in this region taste amazing (Watties [Campbells] even has farms and a packing plant here).
We especially love the silverbeet and carrots. You have not really tasted a carrot until you have tasted a New Zealand carrot. Trust us on this one. We tried growing silverbeet back in Florida. In our sandy loam it grows, but the flavor is awful. Not sure if this is true, but we have been told that the farmers here feed silverbeet to their chickens and this is what makes the yolks so vibrantly yellow.