Also called melon cucumber, Dosakai is a yellow cucumber available in parts of India.
These fruits are generally spherical in shape.
It is commonly cooked as curry, added in sambar or soup, daal and also in making dosa-aavakaaya (Indian pickle) and chutney.
[From Wikipedia link to Cucumber.]
There's plenty that can be done with this delicious vegetable.
For starters, Dosakai Pachadi.