Cut spring onion along with the greens and onions.
Wash them thoroughly under running water.
Cut tomatoes and green chillies also.
Heat 2 Tbsp oil in a kadai add mustard seeds, black gram, fenugreek seeds and red chillies.
Once they start spluttering add asafoetida/hing. Keep this tadka aside.
Now again heat 1 tbsp oil the same kadai, add chopped spring onion, tomato and green chillies.
Add tamarind and cook them till they turn soft and mushy.
Allow this to cool completely.
Add the above tadka and salt into a blender jar, make a coarse powder of it.
Add the cooked spring onion, tomato and chillies too to the jar.
Grind it to make a smooth paste or till the spring onion and tomato mashed completely.
This can be done in mortar and pestle also. It tastes really fantastic.
Again heat 1/2 tbsp oil in another kadai, add mustard seeds, black gram and fenugreek seeds.
Once they started spluttering add hing and curry leaves and add this tadka to the chutney.
Serve this chutney with hot piping rice.