That's what I thought to start with and that was why I was getting nowhere in my search for an answer. But, not having had any replies to my question before your post, I toiled into the wee small hours and lighted upon malabar spinach (basella alba). It seems to fit the bill.
I too thought they resembled malabar spinach, but then wasn't familiar with what grows in Tanzania; so didn't voice my opinion. I tried growing this this year, but the weather is not quite conducive to it's growth. Mine are still tiny plants after a few months and cannot see any signs of climbing. I have given up on them this year.
Oxford. The City of Dreaming Spires.
And then my heart with pleasure fills,
And dances with the daffodils (roses). Taking a bit of liberty with Wordsworth
I don't think the weather was conducive to growing anything this year (worst tomatoes ever). Hopefully you will have better luck with your exotic vegetable next year.
Posts