Heat a kadhai with oil. Splutter cumin seeds. Put curry leaves and dry red chillies.
Then add the chopped bhindi. Put salt, turmeric powder and red chilli powder.

Stir fry till okra is cooked.
Side by side prepares the dahi mixture.
As dahi mixture is ready, add water to the stir-fried okra to reduce its temperature.
This prevents curdling of the dahi.

So in a blender jar, take with dahi, all the other above-mentioned ingredients.
Blend into a homogeneous dahi mixture.
Add this mixture to the stir fried bhindi.

Go on continuously stirring.
Keep the heat very slow.
Cook till your preferred consistency. Put crushed kasuri methi and give a nice gentle mix.
Switch the flame off and let it cool down.