In Sarawak, and in Australia, Mother brought back this vegetable from the garden. She didn't grow it. Once you clear it, it sprouts by itself. We called it Ma See Hin aka Horse Shit spinach. However horrible it sounds, it taste quite nice.
My sister remembers it is called by a better name:
马齿苋 Ma chi xian Mandarin Ma see hin Cantonese Horse teeth
In New Zealand, I became my mum. When I clear my vegetable garden, I got this Ma See Hin. But the parallel ends here, you have to harvest it early. Left too long, it flowers and becomes too stringly. Like my photo.
Amaranthus lividus (Green Amaranth)