"Kook" as the konkani's call it , is also known as Chinese Potatoes in English or "Sambrani gadde" in Kannada.
It is a smaller version of potato that grows mostly in Northern Kerala and parts of Coastal Karnataka in India. Karkala is famous for "Kook" and we get the best "Kook" from Karkala in the Autumn months till late February. It takes some time for a novice to get used to the muddy smell of "Kook"!
These potatoes are widely grown all over China and mostly used in Chinese salads.
This "Kook" is loved by the konkani community, and this dish is one of the most famous of the "Kook" dishes. "Kook" is also used in many coconut based gravy dishes along with different kinds of beans/lentils.

