Name of this plant.

[seabear]

Sounds like "som lim ping".

Very sour, but healthy fruit.

[attachment=331401:2015-07-25 14.54.14.jpg]

[loong]

Maybe the cucumber tree ตะลิงปิง Talingping ?

Difficult to tell from the photo, but Mayom, star gooseberry also has sour fruit and droopy leaves

[troysantos]

Mayom looks a bit different. It's gotta be Talingping.

[gwynt]

From my wife, who knows everything it's Linping, "Tastes like lemon but has a lot of vitamins" not the same as star gooseberry.

[seabear]

Thank you very much, Gentlemen.

I just found it:

Thai: Taling pling or Kaling pring (?).

Scientific: Averrhoa bilimbi.

English: Cucumber treee or Tree sorrel.