1. Wash mangoes and dry them by wiping with a clean dry cloth. Cut mangoes into pieces. see that all the pieces get a portion of hard shell of mango (we call it 'tenka' in telugu) also, while cutting take out the seed ('jeedi')

2. In a large bowl mix red chilli powder, salt, mustard powder, turmeric and methi seeds together. now add oil so that it becomes a wet paste.

3. Add the cut pieces to this wet paste and transfer it into a dry jar.

4. Pour some oil on the top and cover it tightly.

5. On the third day mix it all over again with a laddle.

Enjoy it with rice and oil. (may have it with thick curds too)

This would stay for more than a year.(see that there is no water in jar or bowl while preparing.)