Cut the mango into pieces and boil in water along with turmeric, green chillies, chilly powder and salt.
Grind the coconut with the cumin seeds to a fine paste and add this to the boiling mango.
Bring this to a boil and take off the flame.
Blend the yoghurt to make it smooth and add this to the mixture.
: See to it that the yoghurt does not split.
Heat oil in a pan.
Add mustard seeds and when they crackle, add red chillies and curry leaves.
Add the above seasoning to the above mango curry and mix well.
Sprinkle fenugreek powder and mix well again.
:- Serve the sweet and sour dish with rice.