Boil the potatoes and peel the outerskin.
Take a deep frying pan or a china dish and season with mustardseds, channadal, chillies, ginger and curryleaves in coconut oil
Add the onions and fry till it turns pink in colour.
Now add the boiled potatoes and keep frying it.
Fry in medium heat for 5 minutes.
Now add one half of coconut milk and add salt and let it solidify.
Now add the remaining coconut milk and leave it for 5 or ten minutes in medium heat.
If needed, add little coconut oil and remove the coconut stew from the stove.