Somebody brought in a bag of these the other day and I’d never seen them before so I had somebody write down the name. If I’m summarizing correctly, this may be a kind of olive, or related to olives. What I know is that it was really bitter and sour, the taste of bitter fruits that make your mouth pucker or what the Japanese call shibui (astringent). That explains the bag of chili-laced sugar the ma-kok are sold with (although this also accompanies sweet fruits as well; pineapples, sour mango, various indigenous “apples,” etc.)
I have to be careful to record all of the rare stuff I encounter here because I may never see some of them again.