A bit more information might help. What part of the plant is used, and how is it used - as a veggie or as a flavoring? Do you know what part of Asia? Does it have a particular scent?

check Moringa Oleifera

I second it. It is indeed leaves of Moringa Oleifera!

Agreed! And speaking of Asian plants...any idea what this one is? Supposedly, a few of its (bitter-tasting) leaves boiled in water can help cure the flu...

Perhaps some form of Solanum? A pepper?

@blakrab Centex, is there no flower photo? as it will be lot more helpful,too few leaves..

The plant slightly reminds me of Plumbago zeylanica the doctorbush, we used it as herbs for flu, myalgia and other ailments alike, hence the local name "encok" leaves (myalgia leaves). could it be that? I wonder..

How ever, if it is indeed P zeylanica, we mostly used it topically, as some said it can be toxic, although I've seen recipes of using it boiled and drunk as tea

eta: I think I will add this link as a picture example

Ow.. @Diane Aubin sorry almost forget totally agree that your plant is Moringa Oleifera, the miracle tree. The plants is very useful, tasty as veggies, flower, leaves and young pod. I love to cook young leaves and blossoms for stir-fry or mixed in omelets, and the pod in soups or curry.

the plants is so easy to grow in tropic even in hot-dry climates and poor soils.

^^ Wow, thanks, yea Plumbago zeylanica (aka Citrak or Daun Encok) sounds like a very strong possibility! Would just need flowers to confirm...

Citrak is supposedly very medicinal and antiseptic. However, one site says its roots are poisonous unless prepared properly (soaked in lime water repeatedly), while others prescribe ingestion of the plant, root, or chewing its leaves. So, its rumored toxicity is somewhat vague...