In a mixing bowl, add sour buttermilk, besan, turmeric powder, salt, green chilli paste, ginger paste and sugar. Mix well. Keep it aside.
Now in a pan, add ghee, mustard seeds, cumin seeds, cinnamon, cloves, star anise, methi seeds, hing and curry leaves. Saute it.
Then add chopped garlic and saute it.
Now add kadhi mixture and mix well. Stir continually till mixture starts to boil.
Also add ½ cup water in it. keep flame on medium and boil mixture for 5-7 minutes.
Meanwhile in a mixing bowl, add 1 cup gram flour, turmeric powder, red chilli powder, salt, hing, ajwain and oil. mix well.
Add water gradually and knead medium soft sev dough.
Now in a sev machine, place big hole chakri and grease it with oil. add dough in it and close the machine.
Then hold sev machine on boiling kadhi mixture and move it into circular motion.
Boil sev for 5-7 minutes into kadhi mixture, do not touch it, otherwise it will break.
Now in a tadka pan, add ghee, pinch of cumin seeds, dry red chilli and Kashmiri red chilli powder. Mix well and add tadka into kadhi mixture. Mix well.
Sev kadhi is ready, garnish with coriander leaves.