Add oil in a pan.after heating oil add mustard seeds,cumin seeds and turmeric powder.

Add Finely chopped onion.let it cook for a minute.

Add chopped tomatoes and add salt and let it cook for another 2 minute.

Add coriander powder and red chilli powder.mix very well.add chopped green chilli.cook for a minute.

Add water one and half cup.let it start to boil.

Now when u r serving the sev tamatar then u will add sev in the gravy.

Add sev in the gravy according to per person.i have added one bowl sev for 2 person.

After adding sev let it cook just for half minute.

Then add garam masala,kasuri methi and coriander leaves Finely chopped.mix well.