I grew up in a very Punjabi atmosphere where koftas were cooked at least once a week. This is one of my favorite dishes from childhood. I remember being excited by the surprising tamarind filling inside.
Make the koftas: Peel the bottle gourd and then grate coarsely. Squeeze to remove the excess water. Put in a large bowl, add the besan, chile powder, and salt, and combine well. It will be sticky but manageable. Divide into 8 portions.
Stuff one piece of tamarind into each portion and shape into balls.