Add salt to the cut mangoes and keep in a container with a lid for 24 hours. Shake the container in between for 3-4 times
Next day there will be salt - mango water in the container. Keep the water aside and dry the mango in a sheet without touching each other for 8-9 hours in a sunny place
In medium flame add oil to the pan. when oil is hot add mustard seeds and asofetida and let it splutter. Add turmeric powder and salt - mango water and let it boil. When the water is boiling add the dried mangoes and add chilli powder, continue cooking in a medium flame till the water absorbs and oil separates
Add fenugreek powder, mix well and switch it off