Heat oil on medium heat. Add mustard seeds and asofetida. Cut red chilis in half and add to the pan when mustard seeds start crackling.
Add okra to the pan and stir fry it for 1 minute before adding lemon juice. Then cook for 3-4 minutes before adding turmeric and salt to taste.
Then let the okra cook until is done, which should take about 5-7 minutes.