Wash the flat beans, top, tail, string and halve each of the beans.
Blanch the flat beans in boiling water with a pinch of salt till they are just tender. Drain the water.
Allow to cool down to room temperature, blitz to a smooth paste. Keep aside.
Coarsely grind the fried onions and raisins. Keep aside.
Heat 1 tbsp oil in a pan, throw in the kalonji and green chillies. Allow to splutter.
Add the flat bean paste, sprinkle in the salt and cook till the mashed beans are coming off the pan.
Now add the coarsely ground fried onion and raisin. Give it all a hearty mix.
Adjust seasonings. Finish off with chopped coriander leaves and a generous drizzle of mustard oil. Serve hot with steamed rice.