Add cumin seeds and when it start to crackle add asafoetida.
Now add turmeric powder and sliced potato and parwals.
Add salt and mix well.
Cover the pan with a lid and cook on low heat.
Stir 2-3 times in between.
When potato become soft then add chopped tomato and all the spices
Mix well and then again cover with the lid and cook for about 2 minutes on low heat
Stir 2 times in between, so it will not stick or burn at the bottom of the pan
Add chopped coriander and mix.
Serve with rice or any Indian bread
Notes
NOTE-1- Scraping parwal is optional ,you can just wash and slice them.2-Avoid peeling parwal with a potato peeler as removing thick peel make the parwal soft and lumpy after it gets cooked so if you like crisp parwal then just lightly scrape it.3- In Uttar pradesh we prefer to make dry curry/stir fries in mustard oil but you can also use your preferred oil.4-Addition of potatoes is optional you can make this stir fry with sliced parwals only .5- Remove the black or red seeds only ,no need to remove white seeds from parwals.