Have you tried Jicama aka Yam Bean?

Yam Bean (Jicama) has a delicious and useful tuber that flourishes in our climate zone.  Its crisp white flesh can be used in stir-fries or as a Crudité. Always skin the root.

This plant is easy to grow and self-seeds easily if the pods are allowed to stay on the vine. Prune your bean pods and increase your crop. We don't bother and there is always plenty of yams underneath our Macadamias.

Note: Its seeds are poisonous containing rotenone so only eat the skinned tubers.

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Yam Bean (Jicama) has a poisonous seed and seed pod

Some perennial food plants for our Coffs Coast climate

We try to grow perennial vegetables to supply our needs, not only because they are less work but also because many perennial vegetables suit our climate and many of the annual vegetables we have traditionally eaten better suit climates with cold winters. This may also mean we need to change our diet a little so that we eat more green vegetables. Certainly we need to experiment with preparing our perennial vegetables so that they are as attractive to eat as the vegetables we may have traditionally eaten at our parents' table.

Eating local is also better for the planet.

Kang Kong

Kang Kong grows well in water or moist ground.  Here its broad edible leaves are shown with Lebanese Cress growing in a small pond.