Remove the tough stem from the base of the greens. Wash the leaves in water twice or thrice to make sure they are clean and dirt-free.
Chop the greens into fine threads. The finer they are cut the better they taste.
Heat oil in a thick bottom wok over high heat. Once the oil reaches the smoking point, reduce the heat to low.
Add the dry red chillies and asafoetida. Cook for a few 10 seconds.
Now add the chopped mustard greens with salt, turmeric and red chilli powder. Mix nicely and cover the wok with a lid.
Allow the greens to cook on low flame. It takes 10 -12 minutes. Stir the sabzi at regular intervals to avoid scorching.
Do not cook the greens for too long otherwise, they will become bitter.
There should not remain any liquid of the greens in the kadhai.
Serve Lai Ki Sabzi warm with arhar ki dal and rice.