We carefully tried to eat the seed of M. kemanga. I sliced it in half and it was very fiberous. Some liquid came out so I put it on the back of one of my fingers to see if it was an irritant. It was fine. Then we nibbled a tiny thin piece of the seed for a moment to see if it irritated the tongue. My wife found it bitter, and I thought it might be irritating my tongue, so we gave up on the sliced seeds in soya sauce experiment. There must be something we don't know, like maybe the seed is eaten immature, or maybe it is boiled first.