Shred the green (raw) magoes using a shredder. Keep it aside.
To a heavy bottom-pot add sesame oil. Once hot add mustard and cumin seeds. Let them spluter. Add pinch of asafetida.
Add chana dal, and peanuts. Roast them for a minute.
Next add in the whole red chilies, and slit green chilies.
Add shredded mango along with turmeric and salt. Also add curry leaves now. Adding curry leaves at this stage will make sure they don't burn.
Stir continuously. You will notice mangoes will soften.
Once the mangoes soften, add cooked rice. Mix everything thouroughly. Turn Off the Stove.
Serve hot with side of your favorite pickle, potato stir fry and papadums.