Clean Kachnar buds, break the fat stems and remove them from the buds. Wash these buds 2-3 times with clean water.
Take 2 cups of water(or enough to easily submerege the buds) in a utensil and place it on the gas to boil. Add 1/2 tsp salt to the water. After the water starts to boil put the Kachnar buds in it and when the water again comes to boil let it boil for another 3-4 minutes. Turn off the gas, drain out the water and let the buds cool off.
Break off the stems of the green chillies, wash then finely chop them. Peel, wash and grate ginger then make its paste.
Pour oil in a frying pan(kadhai) and heat, put Heeng and Jeera in hot oil. Once the Jeera is roasted add turmeric powder, coriander powder, finely chopped chillies, ginger paste and gently fry. Put 2 tbsp water, red chilly powder, Amchur powder, salt and also garam masala. Fry all these spices till the spices seem to have a granular texture or oil starts to float over them. Now put the boiled Kachnar buds and green coriander, cook for 3-4 minutes.Turn off the gas, keep the vegetable covered for 4-5 minutes.
Delicious Kachnar ki Kali is ready. Serve with puri, parantha or chapati.