Cut green onion into medium size and separate its white and green parts of the onion.
For garlic paste, in mortal-pestal, add 10-12 garlic cloves, ¼ tsp cumin seeds, 1 tsp coriander powder, and 1 tbsp Kashmiri red chili powder. Crush it coarsely. Kathiyawadi garlic paste is ready.
Heat oil in a pan, add mustard seeds, cumin seeds, hing, chopped green chili, and ginger paste. Sauté for a minute.
Then add the white part of the onion and sauté till it becomes translucent.
Now lower the flame, in a bowl add garlic paste, turmeric powder, coriander powder, red chili powder, Kasuri methi, garam masala, and sour buttermilk. Mix well.
Add masala paste into oil and Sauté till oil separates from the sides of the masala.
Then add the green part of the onion and salt. cover and cook sabzi for 2 minutes.
Now add 1 cup of water and bring it to a boil.
Then add sev and mix well and cook the sabzi for 2 minutes.
Garnish with coriander leaves and serve.