Put the vegetable, onions, green chillies, grated coconut or coconut milk, fenugreek powder and salt in a vessel.
Add a cup of water and stir well.
Cover it and cook in a medium flame, until it is well cooked.
Heat oil in a pan and crackle mustard seeds.
Then, add shallots and red whole chilly & curry leaves.
When the shallots turn brown and chilly is well fried, add this to the above mixture.
Leave this mixture to cool.
Whip the yoghurt well and add that to the above mixture.
*** Note :- Yogurt - you need to add only if you are using cucumber or squash; in case you`re using mangoes, don`t add yogurt.