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Yes off course @freedomshift, some people would use lime water too, but I think salt and sugar can lower the acidity.. besides we still need that acidity a bit😊 keep the unique taste. I think if I learn more about how to make a good and healthy sweetened fruits, I can make it better.

Yes, I sold them to some friends in other provinces. Actually this candied bilimbi also can be found in certain supermarket. Never try to ship it out of Indonesia though.

Thank you so much for your comments, I still have some fruits growing.. need to try other way to find out how is the effect if I subtitute or change the step of the process.

http://theindianvegan.blogspot.com/2012/10/all-about-bilimbi.html

Locals make bilimbi candy and syrup by soaking the fruit in mineral lime overnight and then boiling in sugar several times over two or three days.

https://hort.purdue.edu/newcrop/morton/bilimbi.html

To reduce acidity, it may be first pricked and soaked in water overnight, or soaked in salted water for a shorter time; then it is boiled with much sugar to make a jam or an acid jelly.

It's compared with lemon which is also acidic.

Your post -

the fruit also useful to clean your nails, better than any artificial chemistry liquid in the world. My little sister's friend has started to produce a dish washing liquid using this fruit instead of the lime fruits.

https://hort.purdue.edu/newcrop/morton/bilimbi.html -

Very acid bilimbis are employed to clean the blade of a kris (dagger), and they serve as mordants in the preparation of an orange dye for silk fabrics. Bilimbi juice, because of its oxalic acid content, is useful for bleaching stains from the hands and rust from white cloth, and also tarnish from brass.

That's exactly what I did for my bilimbis but I skip the limewater soaking 😁 because I don't like it crunchy taste