The scientific name is Averrhoa bilimbi. This fruit has a very sour taste and the color of the young fruit is green and if it is old it will turn yellow in my area. This starfruit meal is a menu of fish dishes, or the name of the dish is spicy and sour.
I took this picture in my house delangkang there are some vegetable star fruit trees for cooking needs if you want sour cuisine.
Thanks for sharing. Where are you from?